[media] v4l: vsp1: Fix module autoload for OF registration

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/media/platform/vsp1/vsp1.ko | grep alias
alias:          vsp1

After this patch:

$ modinfo drivers/media/platform/vsp1/vsp1.ko | grep alias
alias:          vsp1
alias:          of:N*T*Crenesas,vsp2C*
alias:          of:N*T*Crenesas,vsp2
alias:          of:N*T*Crenesas,vsp1C*
alias:          of:N*T*Crenesas,vsp1
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/vsp1/vsp1_drv.c

@@ -770,6 +770,7 @@ static const struct of_device_id vsp1_of_match[] = {
 	{ .compatible = "renesas,vsp2" },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, vsp1_of_match);
 
 static struct platform_driver vsp1_platform_driver = {
 	.probe		= vsp1_probe,