net: ethernet: mediatek: remove useless code in mtk_probe()

Remove useless local variables _match_, _soc_ and the code related.

Notice that

const struct of_device_id of_mtk_match[] = {
        { .compatible = "mediatek,mt2701-eth" },
        {},
};

So match->data is NULL.
Suggested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NGustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -2401,15 +2401,10 @@ static int mtk_probe(struct platform_device *pdev)
 {
 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct device_node *mac_np;
-	const struct of_device_id *match;
-	struct mtk_soc_data *soc;
 	struct mtk_eth *eth;
 	int err;
 	int i;
 
-	match = of_match_device(of_mtk_match, &pdev->dev);
-	soc = (struct mtk_soc_data *)match->data;
-
 	eth = devm_kzalloc(&pdev->dev, sizeof(*eth), GFP_KERNEL);
 	if (!eth)
 		return -ENOMEM;