[IA64] Update PV-on-HVM to follow status of interrupt controller

[IA64] Update PV-on-HVM to follow status of interrupt controller

Follow-on to xen-unstable cangeset:
http://xenbits.xensource.com/xen-unstable.hg?cs=fe5ed694b0c2

    - Follow to change a method of interrupt handling in latest
      changeset.
    - Modify to change the spec of callback IRQ in hypervisor side.
    - Modify to follow status of interrupt mask register of virtual
      interupt controller.
    - Modify to deliver interupts to a CPU specified with virtual
      interrupt controller.

http://lists.xensource.com/archives/html/xen-ia64-devel/2006-11/msg00159.html

Signed-off-by: Tsunehisa Doi <Doi.Tsunehisa@jp.fujitsu.com>
Signed-off-by: Kouya SHIMURA <kouya@jp.fujitsu.com>