Make biometric setting toggles show dynamic auth types

Updates the preference toggles shown on the combined biometric settings
screen to indicate which types of biometric sensor (e.g. face and/or
fingerprint) each setting applies to. This is done by checking the
maximum registered strength for each type of sensor.

Test: Manual

Bug: 193714498
Bug: 201306569
Change-Id: I1f27bbe1fdd172ebc899c3c5f1daef9095b338bd