audio: changes ringtone volume when call is comming

the ringtone offset has to be setted to analog side.

Buganizer : 6920555

According to Samsung's spec, the earphone ringtone volume level should
be 14dB lowere than the media playback volume.
On ICS, this behavior was working properly, but on JB this behavior is
not working properly.

Below is the analog and digital volume change from ICS to JB:
ICS : Digital Volume = Normal / Analog volume = lowered 14dB
JB : Digital Volume = increased 14dB (in comparison to ICS) / Analog
volume = lowered 14dB (same as ICS)

Hence the volume in JB has increased by 14dB when compared to ICS.

Bug 6920555.

Change-Id: Ibc248612db378b5b991221468d8f801257ba4103
1 file changed