Enable HDMI Audio (Stereo) in frameworks/base

Enabled HDMI Audio Intent receiving and invoking device connection
handler in AudioSystem.

Change-Id: Ie69452b549fd3bb1b7e8f570904a47f923a294f4
Author: Arulselvan M <arulselvan.m@intel.com>
Signed-off-by: Arulselvan M <arulselvan.m@intel.com>
Signed-off-by: Kumaran S <kumaran.s@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 48114

Conflicts:
	media/java/android/media/AudioService.java