[IA64] change XEN_DOMCTL_getmemlist to return gmfn instead of mfn

[IA64] change XEN_DOMCTL_getmemlist to return gmfn instead of mfn

This patch tries to get 'xm dump-core' work on ia64 again.
With this patch, 'xm dump-core' results in creating core-dump file
as before with a slight format changes.
(machine address array -> pseudo physicall address array)
However xm dump-core has been broken on ia64 since
XEN_DOMCTL_getmemlist/ia64 is differenct from x86's.
This patch does NOT fix it.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>