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: 8e2b9c4d am: 9433e583

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

Change-Id: Ic5b8503360dc82937d2fbc12269c886465211df6