Fingerprint sensor should be AccessibilityHintType BOUNCER

Fingerprint sensor and lock icon should both go to bouncer when
activated via a11y actions.

Tested this with Talkback as well as the latest version of Switch
Access to validate that both of the bugs are fixed

Fixes: 344493721
Fixes: 344740341
Test: manual - activate talkback and be able to activate the udfps to go to bouncer
Test: manual - activate switch access and be able to activate all elements on lockscreen
Test: atest DeviceEntryIconViewModelTest
Flag: EXEMPT bugfix
Change-Id: I5a6997ef353d10032ba97a3cccc8bdc5696db167