Use KeyguardTransitions instead of dozeAmount for udfpsAod animations

The UdfpsKeyguardViewControllerLegacy class
will eventually be completely deprecated, but this
will fix a bad transition from GONE => AOD.

Since the Udfps view is created in the middle of the
gone => aod transition, we cannot rely on the
GoneToAodTransitionViewModel.

Flag: NONE
Test: atest UdfpsKeyguardViewLegacyControllerWithCoroutinesTest
Fixes: 301421775
Change-Id: I47d081c5c546f188944a7cbf51469e027ee050b0