CONFIG_MD_RAID5 became CONFIG_MD_RAID456 in drivers/md/Kconfig.  Make
the same change in arch/ia64
Signed-off-by: NPrarit Bhargava <prarit@redhat.com>
Signed-off-by: NAron Griffis <aron@hp.com>
Acked-by: NJes Sorenson <jes@sgi.com>
Signed-off-by: NTony Luck <tony.luck@intel.com>