mt76: fix the wiphy's available antennas to the correct value

the wiphy's available antennas may be incorrect
When ext phy's antenna_mask is different from main phy
Signed-off-by: Bo Jiao <Bo.Jiao@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mac80211.c

@@ -411,8 +411,8 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw)
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_AIRTIME_FAIRNESS);
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_AQL);
 
-	wiphy->available_antennas_tx = dev->phy.antenna_mask;
-	wiphy->available_antennas_rx = dev->phy.antenna_mask;
+	wiphy->available_antennas_tx = phy->antenna_mask;
+	wiphy->available_antennas_rx = phy->antenna_mask;
 
 	hw->txq_data_size = sizeof(struct mt76_txq);
 	hw->uapsd_max_sp_len = IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL;