[media] sh_mobile_ceu_camera: set field to FIELD_NONE

Make sure that 'field' isn't FIELD_ANY when the driver is
first loaded. Fixes a v4l2-compliance failure.

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>