Revert "Revert "Return enrollment consent status to caller.""

This reverts commit c358adad.

Reason for revert: Applying original change with additional change for single sensor devices.

Bug: 192420564
Bug: 188847063

Test: manual enroll face & fingerprint via setup wizard (on fp, face, & fp+face device variants)

Change-Id: Idfaaa2b6f4611056f9999325bac8401e28a7510b