Updated CMAKE_MODULE_PATH for HIP

[mhilgema-amd]

ROCm 6.x has cmake modules installed under ${ROCM_PATH}/lib/cmake. This fixes the cmake configure error:

-- Found HIP: 6.2.41134
-- HIP PATH: /opt/COE_modules/rocm/rocm-6.2.2
CMake Error at CMakeLists.txt:380 (hip_add_library):
  Unknown CMake command "hip_add_library".

[TysonRayJones]

Hi Martin,
Thanks very much for the contribution! The CMake build has been overhauled on the v4 branch which is currently our de facto develop branch, although (afaik) we haven't yet tested HIP deployment. Would you be able to check this patch is still necessary there, and if so, prepare a PR to the v4 branch? We will eventually merge v4 -> develop -> master.
Thanks very much!

[otbrown]

My own attempts to reinstate HIP support are currently bashing up against incompatibilities in the complex datatypes, possibly related to this issue 😅