Changed module api to work with nvcc and hipcc path

- Added cuda and cudart linking for nvcc path in hipcc
- Added hipMemcpyHtoD and hipMemcpyDtoH for nvcc path
- Changed hipDeviceptr to hipDeviceptr_t
- Fixed hipMemcpy*to* API signatues

Change-Id: I6ef076b507f92502efda475c83dcdcdd462afc37

bin/hipcc

@@ -151,7 +151,7 @@ if ($HIP_PLATFORM eq "hcc") {
     $HIPCC="$CUDA_PATH/bin/nvcc";
     $HIPCXXFLAGS .= " -I$CUDA_PATH/include";
 
-    $HIPLDFLAGS = "";
+    $HIPLDFLAGS = "-lcuda -lcudart";
 } else {
     printf ("error: unknown HIP_PLATFORM = '$HIP_PLATFORM'");
     exit (-1);