net: fec_mxc: simplify fec_get_miibus

No need to provide two prototype for this function.
Use ulong for the first parameter, then this function
could be shared for DM/non DM case.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 450cc0b..74d36f4 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -1012,18 +1012,9 @@
 	free(fec->tbd_base);
 }
 
-#ifdef CONFIG_DM_ETH
-struct mii_dev *fec_get_miibus(struct udevice *dev, int dev_id)
-#else
-struct mii_dev *fec_get_miibus(uint32_t base_addr, int dev_id)
-#endif
+struct mii_dev *fec_get_miibus(ulong base_addr, int dev_id)
 {
-#ifdef CONFIG_DM_ETH
-	struct fec_priv *priv = dev_get_priv(dev);
-	struct ethernet_regs *eth = priv->eth;
-#else
-	struct ethernet_regs *eth = (struct ethernet_regs *)(ulong)base_addr;
-#endif
+	struct ethernet_regs *eth = (struct ethernet_regs *)base_addr;
 	struct mii_dev *bus;
 	int ret;
 
@@ -1283,7 +1274,7 @@
 	fec_reg_setup(priv);
 	priv->dev_id = (dev_id == -1) ? 0 : dev_id;
 
-	bus = fec_get_miibus(dev, dev_id);
+	bus = fec_get_miibus((ulong)priv->eth, dev_id);
 	if (!bus) {
 		ret = -ENOMEM;
 		goto err_mii;