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/reg.h b/net/wireless/reg.h
index 9f495d7..f6ced31 100644
--- a/net/wireless/reg.h
+++ b/net/wireless/reg.h
@@ -104,7 +104,7 @@
  * information for a band the BSS is not present in it will be ignored.
  */
 void regulatory_hint_country_ie(struct wiphy *wiphy,
-			 enum ieee80211_band band,
+			 enum nl80211_band band,
 			 const u8 *country_ie,
 			 u8 country_ie_len);