Since if_nge doesn't contain locking or run with INTR_MPSAFE, mark the interface as IFF_NEEDSGIANT so if_start is run holding Giant.
Since if_nge doesn't contain locking or run with INTR_MPSAFE, mark
the interface as IFF_NEEDSGIANT so if_start is run holding Giant.

Note: this driver does declare and occasionally reference mutexes,
but I believe not nearly enough to provide safety.

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