Merge "Remove "System UI" talkback announcement" into udc-dev am: 818f3183 am: 11681753

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22989401



Change-Id: I434249eab06a6084d603c84fdbdc216a180e6a0d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>