[media] media: uapi: vsp1: Use __u32 instead of u32

Don't use the kernel types in uapi headers.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>