Bluetooth: Audio Squashed gerrits for propagation

Bluetooth: pause music player on A2dp service disconnect

When A2dp service disconnects as part of SSR, it marks a2dp state
as unavailable in Audio module but does not pause music player, as
a result when bluedroid stack restarts as part of sub system restart,
media player does not pause and music continues to play on device
speaker.
This change helps to pause the media player, in addition to marking
a2dp as unavailable, so that media player pauses when a2dp service
forcibly disconnects as part of sub system restart with A2dp in
connected state.

CRs-Fixed: 590462
Change-Id: I05ee5bcc808eb438156b64181d54e8ccabe1e186

Bluetooth: Add Total track number.

Add support to add total number of tracks in
Meta-data

Change-Id: I5b1287f791615adcd4f920fe5c7cae0c7c7b04ea
CRs-Fixed: 627869

Bluetooth: use  virtual sco calls for VOIP

 - use virtualvoicesco connection set-up for VOIP calls
 - cannot simply revert c18c9138
and 25fc29b3 changes because
of aidl modifications involved.

Change-Id: Ib49cb01151a9cea2e94bc7a51ad1f58e877271aa
CRs-Fixed: 598072

Send Media button events as foreground Intent

Send foreground intent for Media Button events to Music Player
so that there is no delay in handling these Intents after the
device is rebooted.

Change-Id: I952a8af93586cb96c0a9f6dc910bfb49287f4b9a
CRs-fixed: 611219
Conflicts:
media/java/android/media/AudioService.java