Try revert LIBPFM_FORCE_PMU

Author: liufengyun

vm/ci/ci_common/common-bench.jsonnet

@@ -43,8 +43,7 @@ local repo_config = import '../../../ci/repo-configuration.libsonnet';
     environment+: {
       ENABLE_POLYBENCH_HPC: 'yes',
       POLYBENCH_HPC_EXTRA_HEADERS: '/cm/shared/apps/papi/papi-5.5.1/include',
-      POLYBENCH_HPC_PAPI_LIB_DIR: '/cm/shared/apps/papi/papi-5.5.1/lib',
-      LIBPFM_FORCE_PMU: 'amd64'
+      POLYBENCH_HPC_PAPI_LIB_DIR: '/cm/shared/apps/papi/papi-5.5.1/lib'
     },
   },