Fix LightRevealScrim jank

The flag activates the light reveal animation for non-AOD scenarios.
However, there were performance regressions because depending on the
device model the screen would turn off slower or faster but sysui would
keep producing frames. This jank would not be visible but it causes
regression metrics to alarm. Depending on the device model the animation
might be cut off for the last couple frames which is acceptable given
that there is no easy deterministic way to coordinate these events.

Bug: b/316451404
Test: None
Flag: ACONFIG com.android.systemui.Flags.FLAG_LIGHT_REVEAL_MIGRATION DEVELOPMENT
Change-Id: Ia911975e3d7175177b65b456a88723d6b205c056