[media] sh_mobile_ceu_camera: Support user-configurable line stride

In image mode, the CEU allows configurable line strides up to 8188
pixels.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[g.liakhovetski@gmx.de: unify sh_mobile_ceu_set_rect() in data-fetch mode]
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>