Changing the ordering for heads up notifications

In the new ranking, notifications with fullscreen
intents always take priority over those without,
such that when you get a call and a message
in succession, you would always see the
call on top and are able to pick it up.

Bug: 22778349
Change-Id: Ia9aaf009998fc9493f513dc71f2649d38ccf7a79
1 file changed