mt76: mt7663: fix up BMC entry indicated to unicmd firmware

BMC entry for MT7663 unicmd firmware should be a broadcast/multicast entry,
not a unicast entry, that is GTK rekey offload would rely on.

Fixes: 13886067 ("mt76: mt7615: add more uni mcu commands")
Cc: Soul Huang <Soul.Huang@mediatek.com>
Suggested-by: YF Luo <Yf.Luo@mediatek.com>
Co-developed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/mcu.c

@@ -1359,8 +1359,8 @@ mt7615_mcu_uni_add_bss(struct mt7615_phy *phy,
 			.short_st = true,
 		},
 	};
-	u8 idx, tx_wlan_idx = 0;
 	int err;
+	u8 idx;
 
 	idx = mvif->omac_idx > EXT_BSSID_START ? HW_BSSID_0 : mvif->omac_idx;
 	basic_req.basic.hw_bss_idx = idx;
@@ -1369,24 +1369,8 @@ mt7615_mcu_uni_add_bss(struct mt7615_phy *phy,
 	case NL80211_IFTYPE_MESH_POINT:
 	case NL80211_IFTYPE_AP:
 		basic_req.basic.conn_type = cpu_to_le32(CONNECTION_INFRA_AP);
-		tx_wlan_idx = mvif->sta.wcid.idx;
 		break;
 	case NL80211_IFTYPE_STATION:
-		if (enable) {
-			struct ieee80211_sta *sta;
-			struct mt7615_sta *msta;
-
-			rcu_read_lock();
-			sta = ieee80211_find_sta(vif, vif->bss_conf.bssid);
-			if (!sta) {
-				rcu_read_unlock();
-				return -EINVAL;
-			}
-
-			msta = (struct mt7615_sta *)sta->drv_priv;
-			tx_wlan_idx = msta->wcid.idx;
-			rcu_read_unlock();
-		}
 		basic_req.basic.conn_type = cpu_to_le32(CONNECTION_INFRA_STA);
 		break;
 	default:
@@ -1395,8 +1379,8 @@ mt7615_mcu_uni_add_bss(struct mt7615_phy *phy,
 	}
 
 	memcpy(basic_req.basic.bssid, vif->bss_conf.bssid, ETH_ALEN);
-	basic_req.basic.bmc_tx_wlan_idx = cpu_to_le16(tx_wlan_idx);
-	basic_req.basic.sta_idx = cpu_to_le16(tx_wlan_idx);
+	basic_req.basic.bmc_tx_wlan_idx = cpu_to_le16(mvif->sta.wcid.idx);
+	basic_req.basic.sta_idx = cpu_to_le16(mvif->sta.wcid.idx);
 	basic_req.basic.conn_state = !enable;
 
 	err = __mt76_mcu_send_msg(&dev->mt76, MCU_UNI_CMD_BSS_INFO_UPDATE,