mt76: mt76x02: make group_wcid the first member in struct mt76x02_vif

Allows mt76 core to cast vif->drv_priv to struct mt76_wcid
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76x02_mac.h

@@ -37,9 +37,8 @@ struct mt76x02_tx_status {
 #define MT_MAX_VIFS		8
 
 struct mt76x02_vif {
+	struct mt76_wcid group_wcid; /* must be first */
 	u8 idx;
-
-	struct mt76_wcid group_wcid;
 };
 
 DECLARE_EWMA(signal, 10, 8);