HID: hid-led: add support for Delcom Visual Signal Indicator G2

Add support for the HID-compliant Delcom Visual Signal Indicator
generation 2 devices.

Successfully tested with part no 904000 from the family of these devices.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>