Nate Lawson 6b74f9b7f5 Implement Cx CPU idle states and updated throttling support.
* Use the cpu_idle_hook() to do idling for C1-C3.
* Use both _CST and the FADT to detect Cx states.
* Use both _PTC and P_CNT for controlling throttling.
* Add a notify handler to detect changes in _CST and _PSS
* Call the _INI function for each processor if present.  This will be
  done by ACPI-CA in the future.
* Fix a bug on SMP systems where CPUs will attach multiple times if the
  bus is rescan.
* Document new sysctls for controlling idling.
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