The calibration procedure overwrites the current value of the timer
counter for a pending oneshot tick event, which is admittedly ok in
the context of initializing Cobalt. However, the previous
implementation maxed the counter value, potentially causing excessive
delay to the host waiting for the overwritten timer event.

Use a shorter delay value when calibrating so that the next shot does
not occur later than one jiffy after we left the calibration
routine. One jiffy is also long enough for preventing the timer to
ever fire while running the calibration loop.