Instead of detecting files (header/library), use cmake's find_package to
locate the required dependencies (hsa-runtime64 and hsakmt).
Adding hsa-runtime64::hsa-runtime64 and hsakmt::hsakmt to the
target_link_libraries also takes care of adding the interfaces include
directories to the search path.
Change-Id: I64eb77c97dac7982ac96d3158ad57df776cc0b53
Laurent Morichetti
acb246f788