xen/grant_table: Rework the prototype of _set_status* for lisibility

xen/grant_table: Rework the prototype of _set_status* for lisibility

It is not clear from the parameters name whether domid and gt_version
correspond to the local or remote domain. A follow-up patch will make
them more confusing.

So rename domid (resp. gt_version) to ldomid (resp. rgt_version). At
the same time re-order the parameters to hopefully make it more
readable.

This is part of XSA-295.

Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>