sound: usxxx: cleanup chip field

The chip field is no longer needed.  Move those of its fields that are
actually used to the device structure itself.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/usx2y/us122l.h b/sound/usb/usx2y/us122l.h
index 61ce5d7..4daf198 100644
--- a/sound/usb/usx2y/us122l.h
+++ b/sound/usb/usx2y/us122l.h
@@ -3,7 +3,8 @@
 
 
 struct us122l {
-	struct snd_usb_audio 	chip;
+	struct usb_device	*dev;
+	int			card_index;
 	int			stride;
 	struct usb_stream_kernel sk;