Bluetooth: Move A2dp State to Disconnected when BT is Turned OFF

Found one timing issue where the A2dp State is Stuck in Connecting
state If User tries to connect to different headset when device is
already connected to headset and does BT ON -> OFF. This change will
allow the state to move properly when BT is turned off if any device
state was connecting previously.

Change-Id: I17bc620551bf735f39327eff59102c14551bcf26
CRs-Fixed: 532903