- Simplify the i8254 timecounter for the alpha since we don't actually have

  an interrupt handler for the i8254.  (Our clock interrupts come from
  elsewhere.)  Instead, use the same algo that i386 uses when the lapic
  timer is in use.  This lets us remove a lot of cruft that tried to handle
  the i8254 interrupts that we weren't even using or setting up a handler
  for.
- G/C a bunch of unused cruft while I'm here.
- Fix the code to not use the rpcc timecounter (similar to TSC) on SMP
  machines to only disable that timecounter if more than one CPU is in
  use by the kernel.  Previously, a UP kernel on a machine with multiple
  CPUs would needlessly disable this timecounter.

MFC after:	1 week

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