Merge "Fix Talkback say twice in MainSwitch" into sc-dev am: bf929bbd am: 8ac7a587 am: fa6beec2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15167655

Change-Id: Ibc9c40f64f7b413bb5f22edfd249335d70748e60