nl80211: Fix management frame sending after driver_ops cleanup

hostapd ended up with unregistered send_mlme() in commit
9f324b61babe2fb2a80544a8739eee065e73cd7b. Fix this by registering the
handler both for wpa_supplicant-AP and hostapd use. [Bug 310]

src/drivers/driver_nl80211.c

@@ -4541,9 +4541,9 @@ const struct wpa_driver_ops wpa_driver_nl80211_ops = {
 	.set_country = wpa_driver_nl80211_set_country,
 #ifdef CONFIG_AP
 	.set_beacon = wpa_driver_nl80211_set_beacon,
-	.send_mlme = wpa_driver_nl80211_send_mlme,
 #endif /* CONFIG_AP */
 #if defined(CONFIG_AP) || defined(HOSTAPD)
+	.send_mlme = wpa_driver_nl80211_send_mlme,
 	.set_beacon_int = wpa_driver_nl80211_set_beacon_int,
 	.get_hw_feature_data = wpa_driver_nl80211_get_hw_feature_data,
 #endif /* CONFIG_AP || HOSTAPD */