Migrate keyguard slice view

Also prevent the smartspace section from attempting to add smartspace
when it is disabled.

Fixes: 310208118
Fixes: 325240672
Test: use AOSP build or manually disable smartspace to ensure on
crashes and correct alignment
Flag: ACONFIG com.android.systemui.keyguard_shade_migration_nssl
STAGING
Flag: ACONFIG com.android.systemui.migrate_clocks_to_blueprint
DEVELOPMENT
Flag: ACONFIG com.android.systemui.keyguard_bottom_area_refactor
STAGING

Change-Id: I675b5a9101656cf0120e6c4805a79a5411e8b97c