Implement the missing glue to let FreeBSD's setup and keycache
programming code know that the "new" style TKIP+MIC programming is
supported.

This fixes the traffic issues I was seeing when doing hostap testing -
where stations would disassociate quite quickly.  It turns out the
hardware is using the wrong key for sending out multicast traffic
and STAs were interpreting this as a MIC failure.

Issue:	#3