Phone: Ignore restart ringer once silent requested when incoming call

Issue: When incall coming, press volume key can make the ringing silent, but
after you select SMS and cancel the dialog box, the ringer re-started.

Solution: Once silent requested when incoming call, keep ringer tone silent
until the call end.

Change-Id: I7261a9b39c7d0965c96971fda7031b385c7a084f
Author: Zhuangzhi Li <zhuangzhi.li@intel.com>
Signed-off-by: Xiaokang Qin <xiaokang.qin@intel.com>
Signed-off-by: Beare, Bruce J <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 32156
Add support for proprietary libaudio voice quality filter

This single commit add support for this feature, which is also
called "Crystal Talk"

Add support for an overlay config key like "motoVoiceQualityConfig"
present in motorola libaudio.

Change-Id: I8752cd07340e6caf53ba8e2f19d24a361de22bee

Conflicts:
	res/values/strings.xml
Set ringtone mode even if ringer is silent.

We need this as we want to attenuate music players even on silent
ringtone, to make the user aware the ringer is playing.

Change-Id: I8784f95996a70ac83fcb2d45231f0c3c209bb4e1