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/CMakeLists.txt

@@ -177,7 +177,7 @@ target_include_directories(amdrocclr_static
 
 target_compile_definitions(amdrocclr_static PRIVATE BSD_LIBELF)
 
-if(${USE_COMGR_LIBRARY} MATCHES "yes")
+if(USE_COMGR_LIBRARY)
   # FIXME: This should not be part of the public interface. Downstream
   # users need to add these definitions. This should be defined in a
   # config header here so other builds don't need to be aware of this.

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()