3/N Use KeyguardSecurityContainerController in KHVC.

Use the KeyguardSecurityContainerController in the
KeyguardHostViewController instead of the view directly.

This actually cleans up KeyguardHostView quite a bit,
with all lot of its business logic moved over to its
view.

The KeyguardSecurityContainerController doesn't do much
except to proxy through calls to its view for now.

Bug: 166448040
Test: atest SystemUITests && manual
Change-Id: I96a27b673c4579983bb07b7fb7ef321a022f0f65