Building from source prefers ROCm version of CK

[tbennun]

Since Composable Kernel is now a part of the ROCm release, building MIOpen from source uses the headers of the pre-installed version rather than the latest version built from source.

To mitigate CMake configuration issues, I had to swap the order of CMAKE_PREFIX_PATHs, i.e., instead of the instructions in the README:

cmake -DMIOPEN_BACKEND=HIP -DCMAKE_PREFIX_PATH="<hip-installed-path>;<rocm-installed-path>;<miopen-dependency-path>" ..

I used:

cmake -DMIOPEN_BACKEND=HIP -DCMAKE_PREFIX_PATH="<miopen-dependency-path>;<rocm-installed-path>" ..

However, that does not resolve the issue where the compiler uses the /opt/rocm-version as the first include directory, which takes precedence over the dependency path. The only way I could resolve this was to remove the ck folder from /opt/rocm-version/include.