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/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index d77a9a8..30fbabf 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -1137,7 +1137,7 @@
 {
 	int i;
 
-	if (sband->band != IEEE80211_BAND_2GHZ)
+	if (sband->band != NL80211_BAND_2GHZ)
 		return;
 
 	if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES))
@@ -1335,7 +1335,7 @@
 	int max_rates = 0;
 	int i;
 
-	for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
+	for (i = 0; i < NUM_NL80211_BANDS; i++) {
 		sband = hw->wiphy->bands[i];
 		if (sband && sband->n_bitrates > max_rates)
 			max_rates = sband->n_bitrates;