Pass the row to the NotificationLayoutInflaters

Let the layout inflaters know about what they're inflating.
Fix a bug about the factories inside NotifLayoutInflaterFactory
overriding a previously inflated view with null.

Bug: 283082473
Test: post notifications and observe
Test: atest NotificationContentInflaterTest NotifLayoutInflaterFactoryTest
Change-Id: I8285eae223b4d1985bdb6f7170c4e1e56877d6fa