Disable PCSampling on upstream branches (#1421)

- PC Sampling ioctls/tests are not up-streamed. They should be skipped
   for any and all upstream branches.

projects/rocr-runtime/libhsakmt/tests/kfdtest/scripts/kfdtest.exclude

@@ -361,4 +361,5 @@ FILTER[RHEL9]=\
 "KFDPCSamplingTest.*"
 
 FILTER[upstream]=\
-"KFDIPCTest.*"
+"KFDIPCTest.*:"\
+"KFDPCSamplingTest.*"