wifi: mt76: mt7925: update mt7925_mcu_sta_phy_tlv for MLO

when we serve MLO during the multiple-linked connection, the chanctx may
be not available in the internal driver, we should get the proper the
band information from link_conf for the MLO-enabled firmware.
Co-developed-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Co-developed-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/6620e00fbeef686fb2041556deba346411eab0f1.1720248331.git.sean.wang@kernel.orgSigned-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7925/mcu.c

@@ -1647,7 +1647,8 @@ mt7925_mcu_sta_phy_tlv(struct sk_buff *skb,
 
 	link_conf = mt792x_vif_to_bss_conf(vif, link_sta->link_id);
 	mconf = mt792x_vif_to_link(mvif, link_sta->link_id);
-	chandef = &mconf->mt76.ctx->def;
+	chandef = mconf->mt76.ctx ? &mconf->mt76.ctx->def :
+				    &link_conf->chanreq.oper;
 
 	tlv = mt76_connac_mcu_add_tlv(skb, STA_REC_PHY, sizeof(*phy));
 	phy = (struct sta_rec_phy *)tlv;