cfg80211: extend ieee80211_operating_class_to_band() for 6GHz

Add 6GHz operating class range as defined in 802.11ax D4.1 Annex E.
Reviewed-by: NPieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: NLeon Zegers <leon.zegers@broadcom.com>
Signed-off-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Link: https://lore.kernel.org/r/1564745465-21234-5-git-send-email-arend.vanspriel@broadcom.comSigned-off-by: NJohannes Berg <johannes.berg@intel.com>

net/wireless/util.c

@@ -1474,6 +1474,9 @@ bool ieee80211_operating_class_to_band(u8 operating_class,
 	case 128 ... 130:
 		*band = NL80211_BAND_5GHZ;
 		return true;
+	case 131 ... 135:
+		*band = NL80211_BAND_6GHZ;
+		return true;
 	case 81:
 	case 82:
 	case 83: