HID: nintendo: add player led support

This patch adds led_classdev functionality to the switch controller
driver. It adds support for the 4 player LEDs. The Home Button LED still
needs to be supported on the pro controllers and right joy-con.

Signed-off-by: Daniel J. Ogorchock <djogorchock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>