Set initial HFP/HSP mic and speaker gain values to max instead of min
Set initial HFP/HSP mic and speaker gain values to max instead of min

To avoid the issue of applications thinking that the headset is muted if
it hasn't sent any update for the gain values it's better to initialize
them to the maximum (15) instead of the minimum (0).

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