Merge "Don't allow an external service to be an A11y service" into tm-dev am: 9172a68c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17394616



Change-Id: I08b21cc2ec4faa6e713afb40ea974f490acd9e5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>