Volume Rocker: Switch from Broadcast to Audioservice.

* Fix volume rocker music track seek.
* Minor fixes

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

Change-Id: If4afda046b9fbebda611615371a718122ffb57b6
Volume Rocker: Do not wake up during track seek.

* After switching to Audioservice track seek works great but it woke the device too if we select both options. Wake only if we do not skip tracks (like raising the volume).

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>