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/M5235EVB.dts b/arch/m68k/dts/M5235EVB.dts
index 1a32539..b170b7b 100644
--- a/arch/m68k/dts/M5235EVB.dts
+++ b/arch/m68k/dts/M5235EVB.dts
@@ -20,3 +20,6 @@
 	status = "okay";
 };
 
+&fec0 {
+	status = "okay";
+};