fix RN Listener warnings

c19354837#148

Author: timok06

android/src/main/java/com/ninty/system/setting/SystemSetting.java

@@ -615,4 +615,15 @@ public void onReceive(Context context, Intent intent) {
             }
         }
     }
+
+    @ReactMethod
+    public void addListener(String eventName) {
+        // Keep: Required for RN built in Event Emitter Calls.
+    }
+
+    @ReactMethod
+    public void removeListeners(int count) {
+        // Keep: Required for RN built in Event Emitter Calls.
+    }
+
 }