[HIP][HIPIFY] Make hipMemcpyParam2D coherent with cuMemcpy2D

+ Makes hip_Memcpy2D struct compatible with CUDA_MEMCPY2D struct
+ Add hipMemcpyParam2D support in nvcc fallback path
+ Update hipify-clang, tests and docs accordingly


[ROCm/hip-tests commit: 66c182946e]

projects/hip-tests/samples/2_Cookbook/11_texture_driver/texture2dDrv.cpp

@@ -71,8 +71,8 @@ bool runTest(int argc, char** argv) {
     copyParam.srcMemoryType = hipMemoryTypeHost;
     copyParam.srcHost = hData;
     copyParam.srcPitch = width * sizeof(float);
-    copyParam.widthInBytes = copyParam.srcPitch;
-    copyParam.height = height;
+    copyParam.WidthInBytes = copyParam.srcPitch;
+    copyParam.Height = height;
     hipMemcpyParam2D(&copyParam);
 
     textureReference* texref;