in order to make our life a tad easier and prevent rogue accesses

to the routing table from the hardware interrupt context defer the
if_link_state_change to the process context.

a token (an interface index) is passed to the workq in order to
make sure that if the interface would be gone by the time syswq
goes around to run the task it would just fall through.

ok henning, mpi, deraadt, claudio

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