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

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



Change-Id: I3a719fc7758c9aa4b28764894348d857c1ba2961
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>