rocr: Add copyright for new files (#886)

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

projects/rocr-runtime/rocrtst/samples/rocm_async/hsatimer.cpp

@@ -1,3 +1,9 @@
+/*
+ * Copyright © Advanced Micro Devices, Inc., or its affiliates. 
+ * 
+ * SPDX-License-Identifier: MIT
+ */
+ 
 #include "hsatimer.hpp"
 
 #define NANOSECONDS_PER_SECOND 1000000000