Merge "Show a dialog preventing face enrollment in split mode." into udc-dev am: 22c608be

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/22460413



Change-Id: I751be0db204e733bc6bbe7fab7ef38d193351fad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>