m68k: add fec fdt overrides to all boards

Add ethernet controller overrides for all involved boards.

Signed-off-by: Angelo Durgehello <angelo.dureghello@timesys.com>
diff --git a/arch/m68k/dts/M54418TWR_nand_mii.dts b/arch/m68k/dts/M54418TWR_nand_mii.dts
index 9b1cb85..8afcb0f 100644
--- a/arch/m68k/dts/M54418TWR_nand_mii.dts
+++ b/arch/m68k/dts/M54418TWR_nand_mii.dts
@@ -23,3 +23,12 @@
 &dspi0 {
 	status = "okay";
 };
+
+&fec0 {
+	status = "okay";
+};
+
+&fec1 {
+	status = "okay";
+	mii-base = <0>;
+};