chore(tools::jtag): add clean when run make

 BC when kernel8.img exist in directory, seems the make script will
 not refresh the image.

tools/raspi4/chainloader/Makefile

@@ -112,7 +112,7 @@ endif
 ##--------------------------------------------------------------------------------------------------
 .PHONY: all doc qemu chainboot clippy clean readelf objdump nm check
 
-all: $(KERNEL_BIN)
+all: clean $(KERNEL_BIN)
 
 ##------------------------------------------------------------------------------
 ## Save the configuration as a file, so make understands if it changed.