Merge "Merge "Clear preferred feature when unregistering MediaRouter2" into rvc-dev am: e7ae4947 am: 8cb3412a am: 6e5a9a14" into rvc-qpr-dev-plus-aosp am: f5dfa714

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11846909

Change-Id: Ie40809997d0388c6e5bc42794e26c4104a6832cc