Fix overlap in udfps_enroll_enrolling

Fix the view overlap on R4 device when setting up fingerprint in
device registration or the font size set to largest. Please see
ag/21478828 for reference.

Test: Manual -
Set up fingerprint in device registration and observe the views
don't overlap.
Set up fingerprint in Settings with font size set to largest and observe the views don't overlap.

Bug: 275119187
Change-Id: I82d2a3941211801e2c4615ba9ba5a917f3cd9ea1