Handle the option USE_COMGR_LIBRARY correctly

This is a follow up to http://gerrit-git.amd.com/c/compute/ec/vdi/+/359563. The setting is now either ON or OFF, never "yes".

Change-Id: I031d013a8d239dc72ef610da81bd31b8b78a3ba8

rocclr/device/rocm/CMakeLists.txt

@@ -37,7 +37,7 @@ target_include_directories(oclrocm
     ${ROCR_INCLUDES})
 
 
-if(${USE_COMGR_LIBRARY} MATCHES "yes")
+if(USE_COMGR_LIBRARY)
   target_compile_definitions(oclrocm
     PRIVATE USE_COMGR_LIBRARY)
 endif()