rocr: Add copyright for new files (#886)

Signed-off-by: Alysa Liu <Alysa.Liu@amd.com>

projects/rocr-runtime/samples/common/hsa_perf_cntrs.cpp

@@ -1,3 +1,9 @@
+/*
+ * Copyright © Advanced Micro Devices, Inc., or its affiliates. 
+ * 
+ * SPDX-License-Identifier: MIT
+ */
+ 
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>