LinuxKPI: 802.11: implement ieee80211_tx_status_ext()
Add an implementation of ieee80211_tx_status_ext() extending the
internal linuxkpi_ieee80211_tx_status() implementation.
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
(cherry picked from commit a839757109891573123d8777b539fafa2d2198bb)