ARM: dts: lpc4357-ea4357: add dac

Enable the DAC on the EA4357 dev kit.
Signed-off-by: Joachim Eastwood <manabian@gmail.com>

arch/arm/boot/dts/lpc4357-ea4357-devkit.dts

@@ -495,6 +495,11 @@ eeprom@57 {
 	};
 };
 
+&dac {
+	status = "okay";
+	vref-supply = <&vcc>;
+};
+
 &emc {
 	status = "okay";
 	pinctrl-names = "default";