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/include/netdev.h b/include/netdev.h
index 86d28ad..68c6d49 100644
--- a/include/netdev.h
+++ b/include/netdev.h
@@ -117,11 +117,7 @@
 	return num;
 }
 
-#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_PHYLIB
 struct phy_device;