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/mcf523x.dtsi b/arch/m68k/dts/mcf523x.dtsi
index 550e824..41c7b9b 100644
--- a/arch/m68k/dts/mcf523x.dtsi
+++ b/arch/m68k/dts/mcf523x.dtsi
@@ -51,6 +51,16 @@
 				timeout-loop = <50000>;
 				status = "disabled";
 			};
+
+			i2c0: i2c@300 {
+				compatible = "fsl-i2c";
+				#address-cells=<1>;
+				#size-cells=<0>;
+				cell-index = <0>;
+				reg = <0x300 0x14>;
+				clock-frequency = <100000>;
+				status = "disabled";
+			};
 		};
 	};
 };