use t620 blob with EGL_MESA_platform_gbm change

[chewitt]

This picks the tweaked t620 blob from #8 (which prob. isn't going to be merged anytime soon) as I need this for an XU4 image that I'm experimenting on.

2020-05-01 07:55:04.242 T:753      INFO <general>: EGL_VERSION = 1.4 Midgard-"r12p0-04rel0"
2020-05-01 07:55:04.242 T:753      INFO <general>: EGL_VENDOR = ARM
2020-05-01 07:55:04.242 T:753      INFO <general>: EGL_EXTENSIONS =  EGL_WL_bind_wayland_display  EGL_KHR_partial_update EGL_KHR_config_attribs EGL_KHR_image EGL_KHR_image_base EGL_KHR_fence_sync EGL_KHR_wait_sync EGL_KHR_gl_colorspace EGL_KHR_get_all_proc_addresses EGL_IMG_context_priority EGL_ARM_pixmap_multisample_discard EGL_KHR_gl_texture_2D_image EGL_KHR_gl_renderbuffer_image EGL_KHR_create_context EGL_KHR_surfaceless_context EGL_KHR_gl_texture_cubemap_image EGL_EXT_create_context_robustness EGL_KHR_cl_event2
2020-05-01 07:55:04.242 T:753      INFO <general>: EGL_CLIENT_EXTENSIONS =  EGL_EXT_client_extensions EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_MESA_platform_gbm EGL_EXT_platform_wayland
2020-05-01 07:55:04.242 T:753     DEBUG <general>: EGL Config Attributes:
2020-05-01 07:55:04.242 T:753     DEBUG <general>:   EGL_BUFFER_SIZE: 32
2020-05-01 07:55:04.242 T:753     DEBUG <general>:   EGL_ALPHA_SIZE: 8
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_BLUE_SIZE: 8
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_GREEN_SIZE: 8
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_RED_SIZE: 8
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_DEPTH_SIZE: 24
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_STENCIL_SIZE: 0
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_CONFIG_CAVEAT: 0x3038
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_CONFIG_ID: 2
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_LEVEL: 0
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_MAX_PBUFFER_HEIGHT: 8192
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_MAX_PBUFFER_PIXELS: 67108864
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_MAX_PBUFFER_WIDTH: 8192
2020-05-01 07:55:04.243 T:753     DEBUG <general>:   EGL_NATIVE_RENDERABLE: 0
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_NATIVE_VISUAL_ID: 875713089
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_NATIVE_VISUAL_TYPE: -1
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_SAMPLES: 0
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_SAMPLE_BUFFERS: 0
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_SURFACE_TYPE: 1029
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_TRANSPARENT_TYPE: 0x3038
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_TRANSPARENT_BLUE_VALUE: 0
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_TRANSPARENT_GREEN_VALUE: 0
2020-05-01 07:55:04.244 T:753     DEBUG <general>:   EGL_TRANSPARENT_RED_VALUE: 0
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_BIND_TO_TEXTURE_RGB: 0
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_BIND_TO_TEXTURE_RGBA: 1
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_MIN_SWAP_INTERVAL: 0
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_MAX_SWAP_INTERVAL: 1
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_LUMINANCE_SIZE: 0
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_ALPHA_MASK_SIZE: 8
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_COLOR_BUFFER_TYPE: 0x308e
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_RENDERABLE_TYPE: 69
2020-05-01 07:55:04.245 T:753     DEBUG <general>:   EGL_CONFORMANT: 69
2020-05-01 07:55:04.258 T:753     DEBUG <general>: CDMAHeapBufferObject::Register - using /dev/dma_heap/reserved
2020-05-01 07:55:04.258 T:753      INFO <general>: Checking resolution 16
2020-05-01 07:55:04.258 T:753     DEBUG <general>: OnLostDevice - notify display change event
2020-05-01 07:55:04.258 T:753   WARNING <general>: CGBMUtils::DestroySurface - surface already destroyed
2020-05-01 07:55:04.258 T:753     DEBUG <general>: CWinSystemGbmEGLContext::DestroyWindow - deinitialized GBM
2020-05-01 07:55:04.302 T:753     DEBUG <general>: CDRMUtils::SetMode - found crtc mode: 1920x1080 @ 60 Hz
2020-05-01 07:55:04.302 T:753     DEBUG <general>: CGBMUtils::CreateSurface - created surface with size 1920x1080
2020-05-01 07:55:04.303 T:753     DEBUG <general>: CWinSystemGbmEGLContext::CreateNewWindow - initialized GBM
2020-05-01 07:55:04.304 T:753      INFO <general>: GL_VENDOR = ARM
2020-05-01 07:55:04.304 T:753      INFO <general>: GL_RENDERER = Mali-T628
2020-05-01 07:55:04.304 T:753      INFO <general>: GL_VERSION = OpenGL ES 3.1 v1.r12p0-04rel0.f9ea82e6bf7f0bb7544260636f375425
2020-05-01 07:55:04.304 T:753      INFO <general>: GL_SHADING_LANGUAGE_VERSION = OpenGL ES GLSL ES 3.10
2020-05-01 07:55:04.304 T:753      INFO <general>: GL_EXTENSIONS = GL_ARM_rgba8 GL_ARM_mali_shader_binary GL_OES_depth24 GL_OES_depth_texture GL_OES_depth_texture_cube_map GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_EXT_read_format_bgra GL_OES_compressed_paletted_texture GL_OES_compressed_ETC1_RGB8_texture GL_OES_standard_derivatives GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_EGL_sync GL_OES_texture_npot GL_OES_vertex_half_float GL_OES_required_internalformat GL_OES_vertex_array_object GL_OES_mapbuffer GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_type_2_10_10_10_REV GL_OES_fbo_render_mipmap GL_OES_element_index_uint GL_EXT_shadow_samplers GL_OES_texture_compression_astc GL_KHR_texture_compression_astc_ldr GL_KHR_texture_compression_astc_hdr GL_KHR_texture_compression_astc_sliced_3d GL_KHR_debug GL_EXT_occlusion_query_boolean GL_EXT_disjoint_timer_query GL_EXT_blend_minmax GL_EXT_discard_framebuffer GL_OES_get_program_binary GL_OES_texture_3D GL_EXT_texture_storage GL_EXT_multisampled_render_to_texture GL_OES_surfaceless_context GL_OES_texture_stencil8 GL_EXT_shader_pixel_local_storage GL_ARM_shader_framebuffer_fetch GL_ARM_shader_framebuffer_fetch_depth_stencil GL_ARM_mali_program_binary GL_EXT_sRGB GL_EXT_sRGB_write_control GL_EXT_texture_sRGB_decode GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent GL_OES_texture_storage_multisample_2d_array GL_OES_shader_image_atomic GL_EXT_robustness GL_EXT_texture_border_clamp GL_OES_texture_border_clamp GL_EXT_texture_cube_map_array GL_OES_texture_cube_map_array GL_OES_sample_variables GL_OES_sample_shading GL_OES_shader_multisample_interpolation GL_EXT_shader_io_blocks GL_OES_shader_io_blocks GL_EXT_gpu_shader5 GL_OES_gpu_shader5 GL_EXT_texture_buffer GL_OES_texture_buffer GL_EXT_copy_image GL_OES_copy_image