net: fec: Enable support for i.MX28 DM_ETH in the fec_mxc.c driver

The fec_mxc.c driver can be reused by i.MX28 when DM_ETH is enabled.
One only needs to add proper compatible and dependency on FEC_MXC in the
Kconfig.
Signed-off-by: NLukasz Majewski <lukma@denx.de>
Reviewed-by: NMarek Vasut <marex@denx.de>

drivers/net/Kconfig

@@ -213,7 +213,7 @@ config FEC_MXC_MDIO_BASE
 
 config FEC_MXC
 	bool "FEC Ethernet controller"
-	depends on MX5 || MX6 || MX7 || IMX8 || VF610
+	depends on MX28 || MX5 || MX6 || MX7 || IMX8 || VF610
 	help
 	  This driver supports the 10/100 Fast Ethernet controller for
 	  NXP i.MX processors.

drivers/net/fec_mxc.c

@@ -1485,6 +1485,7 @@ static int fecmxc_ofdata_to_platdata(struct udevice *dev)
 }
 
 static const struct udevice_id fecmxc_ids[] = {
+	{ .compatible = "fsl,imx28-fec" },
 	{ .compatible = "fsl,imx6q-fec" },
 	{ .compatible = "fsl,imx6sl-fec" },
 	{ .compatible = "fsl,imx6sx-fec" },