softclock swis not bound to specific cpu

[Taku YAMAMOTO]

I noticed that the softclock threads didn't seem to be bound to any cpu.

I'm not sure whether it's the Right Thing (TM) to bind them to the
corresponding cpus though: it might be good to give the scheduler a chance
to rebalance callouts.

I'm about to test the modification like the attached diff.
Comments are welcome.

-- 
-|-__   YAMAMOTO, Taku
 | __ <     <taku at tackymt.homeip.net>

      - A chicken is an egg's way of producing more eggs. -
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