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/cisco/airo.c b/drivers/net/wireless/cisco/airo.c
index d2353f6..4bd9e2b 100644
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -5836,7 +5836,7 @@
 	ch = le16_to_cpu(status_rid.channel);
 	if((ch > 0) && (ch < 15)) {
 		fwrq->m = 100000 *
-			ieee80211_channel_to_frequency(ch, IEEE80211_BAND_2GHZ);
+			ieee80211_channel_to_frequency(ch, NL80211_BAND_2GHZ);
 		fwrq->e = 1;
 	} else {
 		fwrq->m = ch;
@@ -6894,7 +6894,7 @@
 	for(i = 0; i < 14; i++) {
 		range->freq[k].i = i + 1; /* List index */
 		range->freq[k].m = 100000 *
-		     ieee80211_channel_to_frequency(i + 1, IEEE80211_BAND_2GHZ);
+		     ieee80211_channel_to_frequency(i + 1, NL80211_BAND_2GHZ);
 		range->freq[k++].e = 1;	/* Values in MHz -> * 10^5 * 10 */
 	}
 	range->num_frequency = k;
@@ -7302,7 +7302,7 @@
 	iwe.cmd = SIOCGIWFREQ;
 	iwe.u.freq.m = le16_to_cpu(bss->dsChannel);
 	iwe.u.freq.m = 100000 *
-	      ieee80211_channel_to_frequency(iwe.u.freq.m, IEEE80211_BAND_2GHZ);
+	      ieee80211_channel_to_frequency(iwe.u.freq.m, NL80211_BAND_2GHZ);
 	iwe.u.freq.e = 1;
 	current_ev = iwe_stream_add_event(info, current_ev, end_buf,
 					  &iwe, IW_EV_FREQ_LEN);