CPU/MEM HotPlug on x86 in Open Solaris

The integration of:

 PSARC/2009/104 Hot-Plug Support for ACPI-based Systems
 PSARC/2009/550 PSMI extensions for CPU Hotplug
 PSARC/2009/551 acpihpd ACPI Hotplug Daemon
 PSARC/2009/591 Attachment Points for Hotpluggable x86 systems
 6862510 provide support for cpu hot add on x86
 6874842 provide support for memory hot add on x86
 6883891 cmi interface needs to support dynamic reconfiguration
 6884154 x2APIC and kmdb may not function properly during CPU hotplug event.
 6904971 low priority acpi nexus code review feedback
 6877301 lgrp should support memory hotplug flag in SRAT table

Introduces support for hot-adding cpus and memory to a running Xeon 7500 platform.