HID: playstation: expose DualSense lightbar through a multi-color LED.

The DualSense lightbar has so far been supported, but it was not yet
adjustable from user space. This patch exposes it through a multi-color
LED.

Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>