wifi: mt76: mt7925: update mt7925_mac_link_bss_add for MLO

Update band_idx in per-link BSS to be auto for the MLO-enabled firmware
and the MLO-enabled firmware only supports omac index in 0.

The change remains compatible with the non-MLO mode and the older 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/37fcf3ea7b4883840d61f97231277b297e1b15a3.1720248331.git.sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -333,8 +333,9 @@ static int mt7925_mac_link_bss_add(struct mt792x_dev *dev,
 		goto out;
 	}
 
-	mconf->mt76.omac_idx = mconf->mt76.idx;
-	mconf->mt76.band_idx = 0;
+	mconf->mt76.omac_idx = ieee80211_vif_is_mld(vif) ?
+			       0 : mconf->mt76.idx;
+	mconf->mt76.band_idx = 0xff;
 	mconf->mt76.wmm_idx = mconf->mt76.idx % MT76_CONNAC_MAX_WMM_SETS;
 
 	if (mvif->phy->mt76->chandef.chan->band != NL80211_BAND_2GHZ)