[media] usbvision: set field and colorspace

Set the colorspace and field in vidioc_try_fmt_vid_cap().

Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/usb/usbvision/usbvision-video.c

···
 	vf->fmt.pix.bytesperline = vf->fmt.pix.width*
 		usbvision->palette.bytes_per_pixel;
 	vf->fmt.pix.sizeimage = vf->fmt.pix.bytesperline*vf->fmt.pix.height;
+	vf->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+	vf->fmt.pix.field = V4L2_FIELD_NONE; /* Always progressive image */
 
 	return 0;
 }