Merge "Don't allow users to be switched on keyguard when multiple users is...

Merge "Don't allow users to be switched on keyguard when multiple users is disabled" into udc-dev am: aa792b8d am: decd480f am: 7062a366

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23620497



Change-Id: I5e6bbbece53c165fe8da75f7612c768c2e8d8ab2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>