HID: lg-g15: Add support for the G510's M1-M3 and MR LEDs

Add support for controlling the LEDs below the M1-M3 and MR keys
on the G510.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>