enable usb audio hot plugging

Change-Id: I527e0976b6cadacb67084348ffe2de192247529a
Lockscreen VolCtrls : Don't raise volume on skipTrack

Set mIsLongPress to true when longpress was successful to avoid
volume from being changed on release

Change-Id: I874f7d66248e30535dddfec53ddd299718e3fa3d
Merge remote-tracking branch 'github/jellybean' into ds-kang