Change conflatedCallbackFlows to callbackFlows

Face enrollment state is incorrect in a paritcular scenario
FaceProvider shows 1 enrolled face but SystemUI thinks that face is not enrolled.
One possibility is that the conflatedCallbackFlow dropped updates that were posted in quick succession.

Bug: 364902818
Flag: EXEMPT bugfix
Test: NA
Change-Id: I61967d6a9d48e504062e680cbb14e31486cf6569