Support configurable multi-stage UDFPS enrollment

Implements multi-stage enrollment for UDFPS. This implementation
supports both highlighting the progress bar when a help message is
received and configuring the progress thresholds between enroll stages
via an XML resource.

Test: Manual

Bug: 198928407
Bug: 200076382
Change-Id: I6f6111ab0ed29ca7f1be01303f0457764d5afe01