Make app predicates singleton

1. AppLabelPredicate
2. AppRestrictionPredicate

Change-Id: I1fd8611c5dd7ffa6318bcb23de7a973c111910b6
Fixes: 111323520
Test: RunSettingsRoboTests

src/com/android/settings/fuelgauge/batterytip/tips/RestrictAppTip.java

@@ -112,7 +112,7 @@ public class RestrictAppTip extends BatteryTip {
         super.sanityCheck(context);
 
         // Set it invisible if there is no valid app
-        mRestrictAppList.removeIf(new AppLabelPredicate(context));
+        mRestrictAppList.removeIf(AppLabelPredicate.getInstance(context));
         if (mRestrictAppList.isEmpty()) {
             mState = StateType.INVISIBLE;
         }