[media] ivtv/cx18: fix inverted pixel aspect ratio

These two drivers reported the pixel aspect ratio the wrong way around.
This caused qv4l2 to scale the image incorrectly.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>