wifi: cfg80211: support UNII-9 channels in ieee80211_channel_to_freq_khz

Devices that support UNII-9 will call ieee80211_channel_to_freq_khz
with a channel number that can go up to 253.
Allow the new channel numbers in ieee80211_channel_to_freq_khz.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260320102034.efcb7ea1de3c.Ifa4b75a24466de2a1d5707181c9c487618236e4b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Author: egrumbach

net/wireless/util.c

@@ -90,7 +90,7 @@ u32 ieee80211_channel_to_freq_khz(int chan, enum nl80211_band band)
 		/* see 802.11ax D6.1 27.3.23.2 */
 		if (chan == 2)
 			return MHZ_TO_KHZ(5935);
-		if (chan <= 233)
+		if (chan <= 253)
 			return MHZ_TO_KHZ(5950 + chan * 5);
 		break;
 	case NL80211_BAND_60GHZ: