Added new Memory API's (#1399)

Added new memory API's hipMemAllocPitch, hipMemAllocHost, hipMemsetD16, hipMemsetD16Async, hipMemsetD8Async
Modified to support all scenarios hipMemcpyParam2DAsync, hipMemcpyParam2D.

tests/src/test_common.h

@@ -109,6 +109,8 @@ THE SOFTWARE.
 extern size_t N;
 extern char memsetval;
 extern int memsetD32val;
+extern short memsetD16val;
+extern char memsetD8val;
 extern int iterations;
 extern unsigned blocksPerCU;
 extern unsigned threadsPerBlock;