HID: hid-led: add support for ThingM blink(1)

Add support for ThingM blink(1) and make the dedicated ThingM driver
obsolete.

Successfully tested with a blink(1) mk2.

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