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/tests/src/hipDrvMemcpy.cpp

@@ -0,0 +1,26 @@
+#include<iostream>
+#include<hip/hip_runtime.h>
+#include<hip/hip_runtime_api.h>
+
+#define LEN 1024
+#define SIZE LEN<<2
+
+int main(){
+  int *A, *B, *C;
+  hipDeviceptr Ad, Bd;
+  A = new int[LEN];
+  B = new int[LEN];
+  C = new int[LEN];
+  for(int i=0;i<LEN;i++){
+    A[i] = i;
+  }
+  hipMalloc((void**)&Ad, SIZE);
+  hipMalloc((void**)&Bd, SIZE);
+  hipMemcpyHtoD(Ad, A, SIZE);
+  hipMemcpyDtoD(Bd, Ad, SIZE);
+  hipMemcpyDtoH(B, Bd, SIZE);
+  hipMemcpyHtoH(C, B,SIZE);
+  for(int i=0;i<16;i++){
+    std::cout<<A[i]<<" "<<C[i]<<std::endl;
+  }
+}