[PARISC] Further updates to timer_interrupt()

This version (relative to the current tree):
o eliminates "while (ticks_elapsed)" loop. It's not needed.
o drop "ticks_elapsed" completely from timer_interrupt().
o Estimates elapsed cycles (based on HZ) to see which kind of
  math we want to use to calculate "cycles_remainder".
o Fixes a bug where we would loose a tick if we decided
  we wanted to skip one interrupt.

Signed-off-by: Grant Grundler <[email protected]>
Signed-off-by: Kyle McMartin <[email protected]>

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