Merge "Clean up existing a11y listeners when reparenting." into rvc-dev am: 4d3059c0 am: ef328273 am: 64f67d08 am: 9d97fe26

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11707943

Change-Id: I4a57dbaa2a726f80455dab7dfde15d43ca76f9d3