wifi: mt76: mt7996: fix wmm set of station interface to 3

According to connac3 HW design, the WMM index of AP and STA interface
should be 0 and 3, respectively.

Fixes: 98686cd ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Link: https://patch.msgid.link/20240816094635.2391-3-shayne.chen@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7996/main.c

@@ -206,7 +206,7 @@ static int mt7996_add_interface(struct ieee80211_hw *hw,
 	mvif->mt76.omac_idx = idx;
 	mvif->phy = phy;
 	mvif->mt76.band_idx = band_idx;
-	mvif->mt76.wmm_idx = vif->type != NL80211_IFTYPE_AP;
+	mvif->mt76.wmm_idx = vif->type == NL80211_IFTYPE_AP ? 0 : 3;
 
 	ret = mt7996_mcu_add_dev_info(phy, vif, true);
 	if (ret)