Makes NotificationRemoteInputManager a NotificationEntryListener.

This change makes NotificationRemoteInputManager register itself as a
NotificationEntryListener instead of having NotificationEntryManager
separately and explicitly notify it of a notification being removed.

Test: atest SystemUITests, manual
Change-Id: Ib212de504430fd3f543d4c2919e5f434ce2f0aea
11 files changed