Sync nl80211.h with upstream in order to maintain parity with
nl80211_copy.h shipped with hostapd.
This is necessary, as currently the enum value for
NL80211_EXT_FEATURE_RADAR_BACKGROUND mismatches between hostapd and
mac80211. This breaks background radar capability detection in hostapd.
Reported-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David Bauer <mail@david-bauer.net>
