android: Use default adapter in adapter functions
android: Use default adapter in adapter functions

There is no need to pass pointer to adapter between function as there
is only one adapter in android daemon. Also default_adapter is renamed
to adapter.

There is no need to pass adapter pointer as user data since there is
only one adapter present.

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