wifi: mt76: mt7996: fix handling mbss enable/disable

When mbss was previously enabled, the TLV needs to be included when
disabling it again, in order to clear the firmware state.

Fixes: a7908d5 ("wifi: mt76: mt7996: fix non-main BSS no beacon issue for MBSS scenario")
Signed-off-by: Rex Lu <rex.lu@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>

Author: rexlu-mtk

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

@@ -827,7 +827,7 @@ mt7996_mcu_bss_mbssid_tlv(struct sk_buff *skb, struct ieee80211_vif *vif,
 	struct bss_info_uni_mbssid *mbssid;
 	struct tlv *tlv;
 
-	if (!vif->bss_conf.bssid_indicator)
+	if (!vif->bss_conf.bssid_indicator && enable)
 		return;
 
 	tlv = mt7996_mcu_add_uni_tlv(skb, UNI_BSS_INFO_11V_MBSSID, sizeof(*mbssid));