Move status view to keyguard root view

Moves the whole space without breaking it apart (yet). This includes
clocks, smartsapce, notif shelf, and media for split shade mode.

Add a guideline to support split shade in the new constraint layout.

Also, simplify how smartspace views are readded especially following a
config change to make sure they get updated.

Bug: 288242803
Test: atest KeyguardStatusViewControllerTest NotificationPanelViewControllerTest

Change-Id: Ide48b8dcd6d111cec8872bf758e8f78797f7860a