[vdi] Refactor texture/surface reference support.

Change-Id: I8014d82aae7139ef5f95e4b50c4fc6da200dbc9d

tests/src/texture/hipBindTex2DPitch.cpp

@@ -28,9 +28,6 @@ THE SOFTWARE.
 #define SIZE_W 12
 #define TYPE_t float
 
-#if __HIP__
-__hip_pinned_shadow__
-#endif
 texture<TYPE_t, 2, hipReadModeElementType> tex;
 
 // texture object is a kernel argument