Introduce boolean flags to show/hide battery/memory in App info.

This adds two flags:
config_show_app_info_settings_memory
config_show_app_info_settings_battery

Which when individually set to false, will hide them item from "App
info" which is accessed from clicking on an application in Apps &
notifications -> App info.

Bug: 62379413
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=com.android.settings.applications

Change-Id: Ifb3b644901728dc7ea04d13198abddaa7b230538

src/com/android/settings/applications/appinfo/AppBatteryPreferenceController.java

@@ -76,7 +76,9 @@ public class AppBatteryPreferenceController extends BasePreferenceController
 
     @Override
     public int getAvailabilityStatus() {
-        return AVAILABLE;
+        return mContext.getResources().getBoolean(R.bool.config_show_app_info_settings_battery)
+                ? AVAILABLE
+                : DISABLED_UNSUPPORTED;
     }
 
     @Override