tools/python: fix python libxc bindings to pass a max grant version

tools/python: fix python libxc bindings to pass a max grant version

Such max version should be provided by the caller, otherwise the
bindings will default to specifying a max version of 2, which is
inline with the current defaults in the hypervisor.

Fixes: 7379f9e10a ('gnttab: allow setting max version per-domain')
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Ian Jackson <iwj@xenproject.org>
Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Release-Acked-by: Ian Jackson <iwj@xenproject.org>