[PATCH] Add call-volume interface to allow user adjust speaker and mic volume

[Zhang, Zhenhua]

Hi,

Attached is the patch to add call-volume interface for Ofono. It exposes two
properties: 'SpeakerVolume' and 'MicrophoneVolume' to allow user could control
phone volume through lower level driver. The ofono_call_volume_notify() is
used to report call volume property change notification to the upper 
application.

The default volume could be stored in the modem.conf or query from remote.
Each driver could report value in percentage to call-volume through
ofono_call_volume_notify(). And then the call-volume will sync volume with remote
side right after probe().

Please review it.

Regards,
Zhenhua
 
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