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

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



Change-Id: Ibb5cbaf034b9108ea750af644bd34383e38e71e6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>