More video related API fixes

android.telecom.Connection.VideoProvider
* onSetPauseImage takes Uri instead of String
* changeCallDataUsage -> setCallDataUsage
* add quality constants to changeVideoQuality() docs

android.telecom.InCallService.VideoCall
* setPauseImage takes Uri instea dof String

android.telecom.VideoProfile.VideoState
* Move constants to VideoProfile, prefix with STATE_

Bug: 21040387
Bug: 21066505
Change-Id: I764e72aced9d1e2d30d6d0cf0862100860d47c79