Merge "Update lock screen user switcher on settings update and re-create view...

Merge "Update lock screen user switcher on settings update and re-create view stub after disabling multi-user" into sc-dev am: cdd6adb5 am: e0aba10e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14974991

Change-Id: Ibcf022f0b03d251c6b88f055bccfbc355ba5b628