net80211: add new ciphers and RSN flags

These are the rest of the ciphers and RSN flags from 802.11-2016.

• add the rest of the ciphers from 802.11-2016
• add the rest of the RSN flags from 802.11-2016

Of special interest here are the extended key ID field for supporting

1 unicast key (to support seamless rekeying w/out dropping frames)

and the MFP (management frame protection) config bits.

This is a no-op; no code is using these new fields.
(In particular, no code in net80211 uses the RSN capability bits;
but that will change when we start on MFP support.)

Differential Revision: https://reviews.freebsd.org/D44864