Annotate a few which are obsolete (gone).
Naming as usual is questionable and I contemplated using the names
from wpa with a different prefix but then we end up with another mix.

While updating the reference to the newer standard I haven't made
a full pass again and I cannot say which version I used in 2020.

The motivation for this is to get rid of unknown IEs displayed in
ifconfig and elsewhere.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Fixes: 50982d26e45ba (MMIC -> MGMT_MIC)