net: designware: Fix build warnings

When building dm version of designware eth driver on a platform
with 64-bit phys_addr_t, it reports the following warnings:

  drivers/net/designware.c: In function 'designware_eth_probe':
  drivers/net/designware.c:599:2:
    warning: format '%lx' expects argument of type 'long unsigned int',
    but argument 3 has type 'phys_addr_t' [-Wformat]
  drivers/net/designware.c:600:21:
    warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  drivers/net/designware.c:601:21:
    warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

This commit fixes the build warnings.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/net/designware.c

@@ -562,12 +562,12 @@ static int designware_eth_probe(struct udevice *dev)
 {
 	struct eth_pdata *pdata = dev_get_platdata(dev);
 	struct dw_eth_dev *priv = dev_get_priv(dev);
+	u32 iobase = pdata->iobase;
 	int ret;
 
-	debug("%s, iobase=%lx, priv=%p\n", __func__, pdata->iobase, priv);
-	priv->mac_regs_p = (struct eth_mac_regs *)pdata->iobase;
-	priv->dma_regs_p = (struct eth_dma_regs *)(pdata->iobase +
-			DW_DMA_BASE_OFFSET);
+	debug("%s, iobase=%x, priv=%p\n", __func__, iobase, priv);
+	priv->mac_regs_p = (struct eth_mac_regs *)iobase;
+	priv->dma_regs_p = (struct eth_dma_regs *)(iobase + DW_DMA_BASE_OFFSET);
 	priv->interface = pdata->phy_interface;
 
 	dw_mdio_init(dev->name, priv->mac_regs_p);