e428310a56
Currently all the logic checks if __HIP_ENABLE_PCH is set, so setting it
to OFF will still enable PCH.
Switching __HIP_ENABLE_PCH to be a CMake option will enable correct
build behaviour.
Change-Id: I77a663589ffb5f2595c6ad3d144eb9466adcf250
[ROCm/hip commit: 3949675ab0]