V4L/DVB (8962): zr36067: VIDIOC_S_FMT returns the colorspace value

Ioctl VIDIOC_S_FMT is supposed to fill the colorspace value in the
returned buffer.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>