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/broadcom/brcm80211/brcmsmac/main.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c
index 218cbc8..e16ee60 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.c
@@ -7076,7 +7076,7 @@
 	channel = BRCMS_CHAN_CHANNEL(rxh->RxChan);
 
 	rx_status->band =
-		channel > 14 ? IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;
+		channel > 14 ? NL80211_BAND_5GHZ : NL80211_BAND_2GHZ;
 	rx_status->freq =
 		ieee80211_channel_to_frequency(channel, rx_status->band);
 
@@ -7143,7 +7143,7 @@
 		 * a subset of the 2.4G rates. See bitrates field
 		 * of brcms_band_5GHz_nphy (in mac80211_if.c).
 		 */
-		if (rx_status->band == IEEE80211_BAND_5GHZ)
+		if (rx_status->band == NL80211_BAND_5GHZ)
 			rx_status->rate_idx -= BRCMS_LEGACY_5G_RATE_OFFSET;
 
 		/* Determine short preamble and rate_idx */