ARM: sun7i: cubieboard2: Enable the I2C controllers

The Cubieboard2 uses both the i2c0 and i2c1 controllers. Enable them in
the DT.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20-cubieboard2.dts

@@ -48,6 +48,18 @@ uart0: serial@01c28000 {
 			pinctrl-0 = <&uart0_pins_a>;
 			status = "okay";
 		};
+
+		i2c0: i2c@01c2ac00 {
+			pinctrl-names = "default";
+			pinctrl-0 = <&i2c0_pins_a>;
+			status = "okay";
+		};
+
+		i2c1: i2c@01c2b000 {
+			pinctrl-names = "default";
+			pinctrl-0 = <&i2c1_pins_a>;
+			status = "okay";
+		};
 	};
 
 	leds {