timecounter: add timestep eventhandler
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Authored by imp on Sun, Oct 4, 7:20 PM.

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Summary

Invoked after the step, but before we wakeup anything. The event handler
is called only for a time step, but not the time slewing we do with
adjtime. Consumers should view this as a 'gross time adjustment' for
situations where time isn't known at boot, but becomes known later after
a time exchanage with NTP or similar protocol.