MFC revision 1.662 and 1.663:   Disallow the legacy USB circuit to generate an SMI# via an ICH   register (MacBooks only).   This allows MacBooks to boot in SMP mode without any trick and solves   the timer problems with HZ=1000.
MFC revision 1.662 and 1.663:
  Disallow the legacy USB circuit to generate an SMI# via an ICH
  register (MacBooks only).
  This allows MacBooks to boot in SMP mode without any trick and solves
  the timer problems with HZ=1000.

Approved by:	     re (kensmith), njl (mentor)

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