arm64: dts: meson: sei510: enable i2c3

Add the i2c bus used for RGB led controller.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm64/boot/dts/amlogic/meson-g12a-sei510.dts

@@ -161,6 +161,12 @@ hdmi_tx_tmds_out: endpoint {
 	};
 };
 
+&i2c3 {
+	status = "okay";
+	pinctrl-0 = <&i2c3_sda_a_pins>, <&i2c3_sck_a_pins>;
+	pinctrl-names = "default";
+};
+
 &saradc {
 	status = "okay";
 	vref-supply = <&vddio_ao1v8>;