automate gcnarch detection

Change-Id: Ibbad22db136f7f5e2be84c82e9169298a144cc77

samples/1_Utils/hipInfo/hipInfo.cpp

@@ -129,6 +129,7 @@ void printDeviceProp (int deviceId)
     cout << setw(w1) << "arch.hasSurfaceFuncs: " <<           props.arch.hasSurfaceFuncs          << endl;
     cout << setw(w1) << "arch.has3dGrid: " <<                 props.arch.has3dGrid                << endl;
     cout << setw(w1) << "arch.hasDynamicParallelism: " <<     props.arch.hasDynamicParallelism    << endl;
+    cout << setw(w1) << "gcnArch: " <<     props.gcnArch    << endl;
 
     int deviceCnt;
     hipGetDeviceCount(&deviceCnt);