Make face auth ineligible when camera access is disabled

Cherry picked I19556fa7f861f2f7655e792b1da9d74d3cf2259e to master due to b/286408867.

Code was merged via `-s ours` and is missing even though the sha exists on the target branch. Cherry pick is required to bring in the code.

Manually remove the "Merged in" directive to allow for downstream propagation.

Test: Disable camera access in Settings, Open biometric prompt test app
and try to authenticate; Fingerprint authentication should work normally
Bug: 277854521
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:c35a712ab4308e0281c8b2a7adfae8de42d28a6a)
Change-Id: I79e389ad830d82326f0badb7382744faede17a5c