Initial pass at adding Music control to new keyguard.

- View is now added or removed based on AudioManager status
- Reduced depth of hierarchy by making KeyguardTransportControl a KeyguardWidgetFrame
- Return to the status view when we return to keyguard (onScreenTurnedOn)

Change-Id: Id7f9310ce4e7daf663471117564e5670f61b1471
10 files changed