John Baldwin 5714e9ea59 - Don't make the driver lock recursive, it shouldn't be recursively
acquired anywhere in the driver now.
- Axe the spin mutex used for the nve_oslock*() routines.  The driver lock
  already provides sufficient synchronization.
- Don't mess around with IFF_UP when the link state changes.  IFF_UP is
  an administrative flag, not a link status indicator.

MFC after:	1 week
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