mac80211: Use a cfg80211_chan_def in ieee80211_hw_conf_chan

Drivers that don't use chanctxes cannot perform VHT association because
they still use a "backward compatibility" pair of {ieee80211_channel,
nl80211_channel_type} in ieee80211_conf and ieee80211_local.

Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
[fix kernel-doc]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/rtlwifi/rtl8723ae/trx.c

@@ -304,8 +304,8 @@ bool rtl8723ae_rx_query_desc(struct ieee80211_hw *hw,
 
 	status->is_cck = RTL8723E_RX_HAL_IS_CCK_RATE(status->rate);
 
-	rx_status->freq = hw->conf.channel->center_freq;
-	rx_status->band = hw->conf.channel->band;
+	rx_status->freq = hw->conf.chandef.chan->center_freq;
+	rx_status->band = hw->conf.chandef.chan->band;
 
 	hdr = (struct ieee80211_hdr *)(skb->data + status->rx_drvinfo_size
 		+ status->rx_bufshift);