Update keyguard clipping

This resolves an issue with pulling down the QS shade directly over
lockscreen, and unsures that the view is only clipped if the
notficiations scrim is actually visible.

Test: manual - use foldable in both portrait and landscape, and pull
down both QS and QQS shades
Test: atest ScrimControllerTest
Fixes: 322159355
Flag: ACONFIG com.android.systemui.keyguard_shade_migration_nssl
DEVELOPMENT

Change-Id: I2ce6e78a3e3e12cc948454c9027e3a8df1b4f0fd