Add playback of tones to handsfree
Add playback of tones to handsfree

StartEventTone and StopTone method calls to tone generator are added
to maemo6 telephony driver. Such implements playback of DTMF tones
in handsfree to notify user.

ComputeCycles/bluez,mapfau/bluez,ComputeCycles/bluez,pkarasev3/bluez,ComputeCycles/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,silent-snowman/bluez,mapfau/bluez,silent-snowman/bluez,pkarasev3/bluez,pkarasev3/bluez,mapfau/bluez,ComputeCycles/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,silent-snowman/bluez