wifi: mt76: mt7921: fix the firmware version report

Fix the regression of the firmware version report since
'b9ec2710 ('mt76: connac: move mt76_connac2_load_ram in connac
module')'.

Fixes: b9ec2710 ("mt76: connac: move mt76_connac2_load_ram in connac module")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

@@ -2888,6 +2888,10 @@ int mt76_connac2_load_ram(struct mt76_dev *dev, const char *fw_wm,
 		goto out;
 	}
 
+	snprintf(dev->hw->wiphy->fw_version,
+		 sizeof(dev->hw->wiphy->fw_version),
+		 "%.10s-%.15s", hdr->fw_ver, hdr->build_date);
+
 	release_firmware(fw);
 
 	if (!fw_wa)