Added new API, hipMemPtrGetInfo

1. This API returns memory allocation size of pointer
2. Added test to check its functionality

Change-Id: I87976d817b5a6ca5530336c09e7cb0420601cb2c

tests/src/runtimeApi/memory/hipHostGetFlags.cpp

@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2015-2016 Advanced Micro Devices, Inc. All rights reserved.
+Copyright (c) 2015-2017 Advanced Micro Devices, Inc. All rights reserved.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal