Merge "Add a new method to unregister ImsFeatureStatusCallbacks" into rvc-dev am: 63ab0333a6 am: 4cd32dfb63

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/11546332

Change-Id: I7b28dd9279ed07ba38002e97c419cc8aaa273eb2