mt76: mt7921: use correct iftype data on 6GHz cap init

Set 6GHz cap to iftype data which is matched to the type of
current interface.

Fixes: 50ac15a5 ("mt76: mt7921: add 6GHz support")
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -178,7 +178,7 @@ mt7921_init_he_caps(struct mt7921_phy *phy, enum nl80211_band band,
 			if (vht_cap->cap & IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN)
 				cap |= IEEE80211_HE_6GHZ_CAP_RX_ANTPAT_CONS;
 
-			data->he_6ghz_capa.capa = cpu_to_le16(cap);
+			data[idx].he_6ghz_capa.capa = cpu_to_le16(cap);
 		}
 		idx++;
 	}