[Settings] 1.Clean up unnecessary callback 2. register listener and

manager by subId

Bug: 269742364
Test: manual
Change-Id: Id536dedb200385dc6de5697848f8a68f2302351f

src/com/android/settings/network/MobileNetworkSummaryController.java

@@ -206,10 +206,6 @@ public class MobileNetworkSummaryController extends AbstractPreferenceController
         update();
     }
 
-    @Override
-    public void onActiveSubInfoChanged(List<SubscriptionInfoEntity> activeSubInfoList) {
-    }
-
     @Override
     public void onAllUiccInfoChanged(List<UiccInfoEntity> uiccInfoEntityList) {
         mUiccInfoEntityList = uiccInfoEntityList;