Added async memcpy driver api

Change-Id: I90e8a078d668a408e79f9e1142e7534771467a4f

include/hcc_detail/hip_runtime_api.h

@@ -883,7 +883,11 @@ hipError_t hipMemcpyDtoH(void* dst, hipDeviceptr_t src, size_t sizeBytes);
 
 hipError_t hipMemcpyDtoD(hipDeviceptr_t dst, hipDeviceptr_t src, size_t sizeBytes);
 
-hipError_t hipMemcpyHtoH(void* dst, void* src, size_t sizeBytes);
+hipError_t hipMemcpyHtoDAsync(hipDeviceptr_t dst, void* src, size_t sizeBytes, hipStream_t stream);
+
+hipError_t hipMemcpyDtoHAsync(void* dst, hipDeviceptr_t src, size_t sizeBytes, hipStream_t stream);
+
+hipError_t hipMemcpyDtoDAsync(hipDeviceptr_t dst, hipDeviceptr_t src, size_t sizeBytes, hipStream_t stream);
 
 
 /**