RESTRICT AUTOMERGE Support UDFPS multi-stage enrollment

Adds support for showing multiple stages during UDFPS enrollment:
1. Initial touch & center enroll
2. Guided enroll (or continued center enroll for a11y)
3. Fingertip enroll
4. Edge enroll

Test: Manual

Bug: 198858684
Change-Id: I6646db9038d236eca6d6d62e1c7ddf7649e4945e
Merged-In: Ifda20133f1ee90c9e1612e9066c19efbb6ffc9cd
Merged-In: Ic12b85bd6f8f1d4068952eb83bcc8a1df21f2e8e