HPET support added

Sepherosa Ziehau has added the ability to use High Precision Event Timers (HPET) in DragonFly, based on FreeBSD code.  It’s experimental, and he has instructions on how to find if your hardware supports it.  It’s apparently a much faster timer than what is used with ACPI, though I do not have details on how that translates into real-world performance.

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