[ALSA] usb-caiaq - add support for Kore controller 2

Added support for Native Instrument's Kore controller 2. This device has
no audio but MIDI, input devices and ALSA controllers only.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>