Fix the value type of def_noise_suppression

Change-Id: I0b94e9b24af959fa1c16c807ba83890b2ce077ad
Keyguard : Fix album art sticking after playback is stopped

newIsNull should be populated by what is currently being set and not by
what the user's custom background is, since otherwise you end up a in state
where the user has no custom background set, music stops, no album art via arg is provided and you simply return.

Change-Id: Ifaea1cae176faaba6b32a711071f3b75ccacdd63
Merge branch "cm-11.0" into kylin