mac80211: notify driver of rate control updates

Devices that have internal rate control need to be
notified when the bandwidth or SMPS state changes
just like external rate control algorithms get a
notification now.

Add this notification and clarify the change bits
while at it, the HT_CHANGED bit really meant only
bandwidth changed.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/rc.c b/drivers/net/wireless/ath/ath9k/rc.c
index 4e39f27..5fff711 100644
--- a/drivers/net/wireless/ath/ath9k/rc.c
+++ b/drivers/net/wireless/ath/ath9k/rc.c
@@ -1447,7 +1447,7 @@
 
 	/* FIXME: Handle AP mode later when we support CWM */
 
-	if (changed & IEEE80211_RC_HT_CHANGED) {
+	if (changed & IEEE80211_RC_BW_CHANGED) {
 		if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
 			return;