[media] v4l: omap3isp: Fix module autoloading

Platform drivers needs to export the OF id table and this be built
into the module or udev will not have the necessary information to
autoload the driver module when the device is registered via OF.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>