Add face auth a11y action to bouncer view

Test: atest FaceAuthAccessibilityDelegateTest KeyguardSecurityContainerControllerTest
Test: manually enable switch access and see user
has a way to retrigger face auth using switch access
(tested with and without new face auth refactor)
Fixes: 289162753

Merged-In: I42a77f815ec90dab60a3c585a63993e2e1e579d9
Change-Id: I42a77f815ec90dab60a3c585a63993e2e1e579d9