[Settings] 1.Clean up unnecessary callback 2. register listener and am: 5645c092

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/21478832



Change-Id: Ie7bfd2a150f5ff203b5566876457d87b5ddbf8de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>