x86/pvh: use a custom IO bitmap for PVH hardware domains

x86/pvh: use a custom IO bitmap for PVH hardware domains

Since a PVH hardware domain has access to the physical hardware create a
custom more permissive IO bitmap. The permissions set on the bitmap are
populated based on the contents of the ioports rangeset.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>