Stop running face detection on bouncer if both face and fp are enrolled.

Add s'more tests
https://screencast.googleplex.com/cast/NTE1ODQ4MjYyMjgwODA2NHxkY2FkNzg5MC1jZg

Fixes: 232876541
Test: atest KeyguardUpdateMonitorTest
Test: verified manually
Change-Id: Ia51bd773e90024159ce68d6b5536be440887eaa9