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/net/wireless/mlme.c b/net/wireless/mlme.c
index ff32825..c284d88 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -726,7 +726,7 @@
 	wiphy = &rdev->wiphy;
 
 	rtnl_lock();
-	for (bandid = 0; bandid < IEEE80211_NUM_BANDS; bandid++) {
+	for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
 		sband = wiphy->bands[bandid];
 		if (!sband)
 			continue;