m68k: dts: add i2c nodes

Add all the i2c nodes for each family, and add specific i2c
overwrites in the related board-specific dts.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
diff --git a/arch/m68k/dts/M5208EVBE.dts b/arch/m68k/dts/M5208EVBE.dts
index 78973fc..1c32718 100644
--- a/arch/m68k/dts/M5208EVBE.dts
+++ b/arch/m68k/dts/M5208EVBE.dts
@@ -23,3 +23,9 @@
 &fec0 {
 	status = "okay";
 };
+
+&i2c0 {
+	clock-frequency = <80000>;
+	u-boot,i2c-slave-addr = <0x7f>;
+	status = "okay";
+};