Don't search ROCclr_DIR for prof_protocol.h

This points to the cmake directory where the find module was found,
not a prefix for where it was found.

Based on the search below looking in roctracer, searching in ROCclr
for the header doesn't make much sense. The header should be either
provided by ROCclr xor roctracer. Having it possibly be provided by
two different dependencies is confusing, and a potential source of
version mismatch problems.

Change-Id: Ic2f6ec03f9a7b86225cf7e5c43f39a1360318a34

rocclr/CMakeLists.txt

@@ -58,7 +58,6 @@ if (NOT ROCclr_FOUND)
   include(${LIBROCclr_STATIC_DIR}/amdrocclr_staticTargets.cmake)
 endif()
 
-set(PROF_API_HEADER_PATH ${ROCclr_DIR}/platform)
 #############################
 # Profiling API support
 #############################