Rewire setDozing() to use repositories

Testing out the process of convert existing events, which is a mix of
both callbacks and direct calls to injected controllers, over to
flowable streams through the KeyguardRepository.

Test: atest DozeServiceHostTest KeyguardRepositoryImplTest
FoldAodAnimationControllerTest
Test: Manually fold/unfold the device
Bug: 242853098

Change-Id: I8864c413cd136e7cb831736331160bea04e98222