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Subject[RFC 0/4] Using HPET in MSI mode and setting up per CPU HPET timers

Patchset that uses HPET timers in MSI mode (when supported) and sets up per
CPU HPET timers. This removes the dependency on IRQ0 timer broadcast with LAPIC
stopping in deep C-state, on platforms that support HPET MSI mode.

On my test system with dual core CPU, the number of timer related interrupts
(HPET_MSI + IRQ0 + LAPIC) comes down from 180 to 95 over a period of 10s,
with these patches.
This is on an idle system with tickless enabled and when system is idle.

Patches against tip.

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