media: m2m-deinterlace: remove unused struct 'vb2_dc_conf'

'vb2_dc_conf' has been unused since the original
commit 8f0755c0 ("[media] media: Add mem2mem deinterlacing driver").

Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/m2m-deinterlace.c

@@ -724,10 +724,6 @@ static const struct v4l2_ioctl_ops deinterlace_ioctl_ops = {
 /*
  * Queue operations
  */
-struct vb2_dc_conf {
-	struct device           *dev;
-};
-
 static int deinterlace_queue_setup(struct vb2_queue *vq,
 				unsigned int *nbuffers, unsigned int *nplanes,
 				unsigned int sizes[], struct device *alloc_devs[])