Move the inflation away from the statusbar

Since the notifications need to inflate more dynamically
based on their own state, the inflation is moved away
from the statusbar.
This also improves the apply inplace logic, that was
reinflating all views even if only a single notification
layout was changed.

Test: runtest systemui
Bug: 35125708
Change-Id: I42a33065ab60b7c45ca979ae2d7baa1518bf92b7