mt76: mt7915: make vif index per adapter instead of per band

The firmware treats it as global, so we need to avoid collisions here
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -161,7 +161,7 @@ static int mt7915_add_interface(struct ieee80211_hw *hw,
 	    is_zero_ether_addr(vif->addr))
 		phy->monitor_vif = vif;
 
-	mvif->idx = ffs(~phy->mt76->vif_mask) - 1;
+	mvif->idx = ffs(~dev->mphy.vif_mask) - 1;
 	if (mvif->idx >= MT7915_MAX_INTERFACES) {
 		ret = -ENOSPC;
 		goto out;
@@ -186,7 +186,7 @@ static int mt7915_add_interface(struct ieee80211_hw *hw,
 	if (ret)
 		goto out;
 
-	phy->mt76->vif_mask |= BIT(mvif->idx);
+	dev->mphy.vif_mask |= BIT(mvif->idx);
 	phy->omac_mask |= BIT_ULL(mvif->omac_idx);
 
 	idx = MT7915_WTBL_RESERVED - mvif->idx;
@@ -241,7 +241,7 @@ static void mt7915_remove_interface(struct ieee80211_hw *hw,
 	rcu_assign_pointer(dev->mt76.wcid[idx], NULL);
 
 	mutex_lock(&dev->mt76.mutex);
-	phy->mt76->vif_mask &= ~BIT(mvif->idx);
+	dev->mphy.vif_mask &= ~BIT(mvif->idx);
 	phy->omac_mask &= ~BIT_ULL(mvif->omac_idx);
 	mutex_unlock(&dev->mt76.mutex);