x86, hwmon: Package Level Thermal/Power: power limit

Power limit notification feature is published in Intel 64 and IA-32
Architectures SDMV Vol 3A 14.5.6 Power Limit Notification.

It is implemented first on Intel Sandy Bridge platform.

The patch handles notification interrupt. Interrupt handler dumps power limit
information in log_buf, logs the event in mce log, and increases the event
counters (core_power_limit and package_power_limit). Upper level applications
could use the data to detect system health or diagnose functionality/performance
issues.

In the future, the event could be handled in a more fancy way.

Signed-off-by: Fenghua Yu <[email protected]>
LKML-Reference: <[email protected]>
Reviewed-by: Len Brown <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>

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