ALSA: snd-usb-caiaq: Add support for Traktor Audio 2

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/caiaq/device.h b/sound/usb/caiaq/device.h
index e3d8a3e..b2b3101 100644
--- a/sound/usb/caiaq/device.h
+++ b/sound/usb/caiaq/device.h
@@ -17,6 +17,7 @@
 #define USB_PID_GUITARRIGMOBILE		0x0d8d
 #define USB_PID_TRAKTORKONTROLX1	0x2305
 #define USB_PID_TRAKTORKONTROLS4	0xbaff
+#define USB_PID_TRAKTORAUDIO2		0x041d
 
 #define EP1_BUFSIZE 64
 #define EP4_BUFSIZE 512