net: ixp4xx_eth: use dev_get_platdata()

Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly. This is a cosmetic change
to make the code simpler and enhance the readability.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/xscale/ixp4xx_eth.c

@@ -1384,7 +1384,7 @@ static int eth_init_one(struct platform_device *pdev)
 {
 	struct port *port;
 	struct net_device *dev;
-	struct eth_plat_info *plat = pdev->dev.platform_data;
+	struct eth_plat_info *plat = dev_get_platdata(&pdev->dev);
 	u32 regs_phys;
 	char phy_id[MII_BUS_ID_SIZE + 3];
 	int err;