Add DIE_MCA_MONARCH_LEAVE and DIE_MCA_RENDZVOUS_LEAVE
events handling in kdump_init_notifier().

We let ia64_mca_handler() and ia64_mca_rendez_int_handler()
to perform the MCA handling. The slave cpus will be sent to the
SAL slave loop on the DIE_MCA_RENDZVOUS_LEAVE event, and the
monarch will start the kdump kernel on the DIE_MCA_MONARCH_LEAVE
event.

I initially created a machine_kdump_on_mca() but decided
to simply use machine_kdump_on_init() in the case of
DIE_MCA_MONARCH_LEAVE since no special handling is needed.


signed-Off-By:  Jay Lan <jlan@sgi.com>