Merge "Fix the problem that the unknown item will be announced when using...

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

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

Change-Id: Ia82a0ca621244aa266f9fdb5025118aa3fd21ed3