Screen on/off event cleanup

Begin breakup of KeyguardViewMediator/KeyguardUpdateMonitor into
smaller/testable units. Screen on/off events were already marked
deprecated and split into KeyguardLifecyclesDispatcher and already
called from KeyguardService. Step 1 of this removal.

Bug: 195430376
Test: atest KeyguardIndicationControllerTest KeyguardViewMediatorTest KeyguardIndicationControllerGoogleTest
Change-Id: I6d57305db9c6ec7d598195eef4ef28c46de8dbbc