Move loader interface functions into rocr namespace.

For static linking all non-API functions must have internal linkage
or be in project namespace to avoid colliding with application symbols.

Change-Id: I3398e40a387cca36f3ddef2b978306c765161d72

runtime/hsa-runtime/core/runtime/hsa.cpp

@@ -56,7 +56,7 @@
 #include "core/inc/signal.h"
 #include "core/inc/cache.h"
 #include "core/inc/amd_loader_context.hpp"
-#include "inc/hsa_ven_amd_loader.h"
+#include "core/inc/hsa_ven_amd_loader_impl.h"
 #include "inc/hsa_ven_amd_aqlprofile.h"
 #include "core/inc/hsa_ext_amd_impl.h"