cfg80211: remove enum ieee80211_band

This enum is already perfectly aliased to enum nl80211_band, and
the only reason for it is that we get IEEE80211_NUM_BANDS out of
it. There's no really good reason to not declare the number of
bands in nl80211 though, so do that and remove the cfg80211 one.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index fe795fc..8ddd604 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1112,7 +1112,7 @@
 				bool is_2ghz;
 				struct modal_eep_header *pmodal;
 
-				is_2ghz = info->band == IEEE80211_BAND_2GHZ;
+				is_2ghz = info->band == NL80211_BAND_2GHZ;
 				pmodal = &eep->modalHeader[is_2ghz];
 				power_ht40delta = pmodal->ht40PowerIncForPdadc;
 			} else {
@@ -1236,7 +1236,7 @@
 
 		/* legacy rates */
 		rate = &common->sbands[tx_info->band].bitrates[rates[i].idx];
-		if ((tx_info->band == IEEE80211_BAND_2GHZ) &&
+		if ((tx_info->band == NL80211_BAND_2GHZ) &&
 		    !(rate->flags & IEEE80211_RATE_ERP_G))
 			phy = WLAN_RC_PHY_CCK;
 		else