Merge "Fix the problem that the unknown item will be announced when using Switch Access." into sc-dev am: a46e16bd am: b226d900 am: ad46e902

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15109466

Change-Id: Ifde9109ace36220ac9d777138c12b9ee9449cada