Run lock before fingerprint enroll

Run setOrConfirmCredentialsNow() before enrolling fingerprint for
fingerprint-only device.

Bug: 237433373
Test: atest BiometricEnrollActivityTest
Test: Manually test SUW flows for fingerprint-only device
      1. check confirm pin case
      2. check choose pin case
      3. enable always_finish_activities, check confirm pin case
      4. enable always_finish_activities, check choose pin case
Change-Id: I68da429145835fc79f83f3292749088dc25fdeee