[IA64] Remove duplicated members in iosapic_rte_info

Remove duplicated members in iosapic_rte_info in iosapic.c. This patch
has no functional changes.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>