wifi: mt76: dynamic channel bandwidth changes in AP mode

Allow AP to change channel width for 40Mhz intolerant STA on the
2.4 GHz band.
Signed-off-by: Himanshu Goyal <himanshu.goyal@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mac80211.c

@@ -418,7 +418,8 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw)
 	SET_IEEE80211_DEV(hw, dev->dev);
 	SET_IEEE80211_PERM_ADDR(hw, phy->macaddr);
 
-	wiphy->features |= NL80211_FEATURE_ACTIVE_MONITOR;
+	wiphy->features |= NL80211_FEATURE_ACTIVE_MONITOR |
+			   NL80211_FEATURE_AP_MODE_CHAN_WIDTH_CHANGE;
 	wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH |
 			WIPHY_FLAG_SUPPORTS_TDLS |
 			WIPHY_FLAG_AP_UAPSD;