Do not show Keyguard Presentation when in new RDM

Also updates KeyguardDisplayManager to:
1) Use the new DeviceState APIs, so we can stop relying on resource
   overlays
2) Check display using Display.FLAG_REAR, so that we do not need to
   rely on resource overlays

Fixes: 384100006
Fixes: 384089052
Test: atest KeyguardDisplayManagerTest
Flag: EXEMPT Bugfix
Change-Id: Ib52e50fe088172f04d72ac85aa238aa8823fce46