plugins/sixaxis: Add a get_leds_data() function
plugins/sixaxis: Add a get_leds_data() function

Get all the data necessary to set the LEDs in a single function,
returning a leds_data structure to be passed as argument to the
setup_leds() callback.

For now only a 'bitmap' field is used, which is the only thing that
set_leds_hidraw() needs.

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