Add support to channel pattern in Serial interface.
Add support to channel pattern in Serial interface.

Application can give RFCOMM channel as pattern for Serial.Connect and
Serial.Disconnect, in case of no service matching the given channel it
wont trigger the channel discover proceeding directly to connection phase.

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