Make API one-way

Convert the return values to values that will be returned through the
callback. Separate the ranges by SUCCESS of the request or ERROR.

Test: CTS tests
Fixes: 199829900
Change-Id: If32083e52ed87a79953c952bbaadd8d977e0226c

core/java/com/android/internal/statusbar/IStatusBarService.aidl

@@ -160,5 +160,5 @@ interface IStatusBarService
      */
     void suppressAmbientDisplay(boolean suppress);
 
-    int requestAddTile(in ComponentName componentName, in CharSequence label, in Icon icon, int userId, in IAddTileResultCallback callback);
+    void requestAddTile(in ComponentName componentName, in CharSequence label, in Icon icon, int userId, in IAddTileResultCallback callback);
 }