Fix issue where notifications are visible during screen off if bypass is enabled.

- NotificationWakeUpCoordinator should prioritize screen off doze override.
- We should tell the stack scroll layout to switch to KEYGUARD so that it doesn't show notifs even if bypass is enabled.

Fixes: 190227875
Test: with/without face unlock and bypass
Change-Id: I902692fa6ae417c051a77b248fd3863f51e0bc36