[media] sh-veu: don't use COLORSPACE_JPEG

COLORSPACE_JPEG should only be used for JPEGs. Use SMPTE170M instead,
which is how YCbCr images are usually encoded.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>