[CS] Move KeyguardBottomAreaView's provider to ShadeModule.

This isn't the *best* location for this provider, but it's where it has
to be (for now) because that's where NotificationPanelView is provided.

Bug: 277762009
Test: manual: verify keyguard bottom area gets re-inflated on font
change and still works correctly after font change (lockscreen
shortcuts still work, bottom area text updates based on events)

Change-Id: Ieb2a3e0af7adac6d470f3c610babafd9fa4cf579