xen/gntdev: use types from linux/types.h in userspace headers
xen/gntdev: use types from linux/types.h in userspace headers

__u32, __u64 etc. are preferred for userspace API headers.

Signed-off-by: Mikko Rapeli <2e21e1b6c51754ec8fff174195e04d29e999b535@iki.fi>
Signed-off-by: David Vrabel <b9d45bd1f671e508cd8daa63dfc3cabb597562df@citrix.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs