xen: use correct type for physical addresses
xen: use correct type for physical addresses

When converting a pfn to a physical address be sure to use 64 bit
wide types or convert the physical address to a pfn if possible.

Signed-off-by: Juergen Gross <29bbaec13092d36559e3abc6f27f7d09c395819f@suse.com>
Tested-by: Boris Ostrovsky <b41c17b861974b03cec38e3ec2992769b9bfae55@oracle.com>
Signed-off-by: David Vrabel <b9d45bd1f671e508cd8daa63dfc3cabb597562df@citrix.com>

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