Merge "Unregister the tethering internal callback in finalize" am: f8d1f3d1cd am: c472eed19a am: e92e0a4e9a am: eed118a4bf

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1838543

Change-Id: If4d032058b4e28dfb70ceb1064e4bc5e4dfbdf00