mt76: mt7615: increase MCU command timeout

MCU_EXT_CMD_EFUSE_BUFFER_MODE needs more time on initialization, and
with only 10 seconds it sometimes runs into timeouts.
Signed-off-by: NFelix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/mcu.c

@@ -144,7 +144,7 @@ mt7615_mcu_msg_send(struct mt76_dev *mdev, int cmd, const void *data,
 		    int len, bool wait_resp)
 {
 	struct mt7615_dev *dev = container_of(mdev, struct mt7615_dev, mt76);
-	unsigned long expires = jiffies + 10 * HZ;
+	unsigned long expires = jiffies + 20 * HZ;
 	struct sk_buff *skb;
 	int ret, seq;