Adding Paul as co-maintainer of Xen support to help ensure that things
don't fall through the cracks when I spend three months at a time
travelling...
Signed-off-by: NDavid Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: NPaul Durrant <paul@xen.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>