LinuxKPI: 802.11 updates
Add more values to the ieee80211_min_mpdu_start_spacing enum with
two missing given we do not know how they are called. Also update
the reference while here.
Add struct ieee80211_hdr_3addr and correct the comment on the
ieee80211_hdr to match the one in net80211 to avoid future confusion.
Sponsored by: The FreeBSD Foundation
(cherry picked from commit d296b65d899249da24a8b277554df4af93357b36)