net80211: migrate the ioctl API to a 128 bit specific API + use key APIHEADmain

* Begin migrating the ioctl code to use the key management APIs.
  Not all of it has been migrated (notably the WEP API hasn't.)

* Take special care to copy the TKIP MIC in and out correctly.

* Note that some of the defines used as sizes are actually the ioctl
  sizes, they'll need to be fixed before I push this into a review.

* Document this current API as a specific 128 bit key + 128 bit
  TKIP MIC API.

The goal here is to solidify this stuff as the 128 bit ioctl API
and not change it, even if net80211 will eventually grow 256 and
384 bit key support.

Notably the TKIP stuff - the driver_bsd.c code puts the TKIP after
the normal key contents, whereas the net80211 code puts the TKIP
stuff in the /end/ of the key buffer.  They happen to be equivalent
when ioctl key buffer size == net80211 key buffer size, but as I learnt
the last couple times I tried this, they're not always going to be
equivalent.

Differential Revision:	https://reviews.freebsd.org/D58384

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