Clear identity when checking strongauth flags

Fixes: 161557889
Fixes: 161566755

Test: atest FingerprintManagerTest
Test: AccessibilityFingerprintGestureTest#testGestureDetectionListener_whenAuthenticationStartsAndStops_calledBack

Merged-In: Icb273fc0cf2ce1891550130539c0b2e6e788b533
Change-Id: I9ebed8adc401fc745f581c8e0fe38c3790dd5fb6
1 file changed