Merge "Limit biometric enrollments when Unicorn account is present." into sc-dev am: 12e161d1dc am: 21ef1830ea

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/15413152

Change-Id: I9980fa2cbaabec648590902df007d21ab1c7f893