[Settings] Convert to getSystemService(Class<T>)

Change to getSystemService(Class<T>) to align the capability with framework
part.

Bug: 179640862
Test: local
Change-Id: I1b4812044fc4876bec6645570049a60f9470dbbd

src/com/android/settings/wifi/p2p/WifiP2pPreferenceController.java

@@ -71,7 +71,7 @@ public class WifiP2pPreferenceController extends AbstractPreferenceController
         super(context);
         mWifiManager = wifiManager;
         lifecycle.addObserver(this);
-        mLocationManager = (LocationManager) context.getSystemService(Service.LOCATION_SERVICE);
+        mLocationManager = context.getSystemService(LocationManager.class);
     }
 
     @Override