Added explicit memory copy direction apis

- Fixed stale printf in context api
- Added 4 sync memcpy apis
  1. hipMemcpyHtoD
  2. hipMemcpyDtoH
  3. hipMemcpyDtoD
  4. hipMemcpyHtoH
- Added test for added apis

Change-Id: I4a9c382445b62631f8d0bcbb9a670322288b72b1


[ROCm/hip commit: 4152746e26]

projects/hip/src/hip_context.cpp

@@ -32,7 +32,6 @@ thread_local std::stack<ihipCtx_t *>  tls_ctxStack;
 hipError_t ihipCtxStackUpdate()
 {
     //HIP_INIT_API();
-    printf("Inside ihipCtxStackUpdate\n");
     hipError_t e = hipSuccess;
 
     if(tls_ctxStack.empty()) {