Merge "Update lock screen user switcher on settings update and re-create view stub after disabling multi-user" into sc-dev am: cdd6adb5 am: b6bcdc9f am: aadd17a9

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

Change-Id: I5163a67e7ab68cce17fd68f99d2235927cd793d2