Remove ControllerLink

Bug: 128591619
Test: atest com.android.settings.notification.RemoteVolumePreferenceControllerTest
      atest CtsMediaTestCases:android.media.cts.MediaSessionTest;
      atest CtsMediaTestCases:android.media.cts.MediaControllerTest;
      atest CtsMediaTestCases:android.media.cts.MediaBrowserTest;
      atest CtsMediaTestCases:android.media.cts.MediaSessionManagerTest;
Change-Id: I4a975f8a24aaa4e5beb54515f3319f9597b76eb5