ARM: dts: imx23-evk: enable Low Resolution ADC

The i.MX23 has a internal Low Resolution ADC; this enables the support
for this device.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx23-evk.dts

@@ -90,6 +90,11 @@
 		};
 
 		apbx@80040000 {
+			lradc@80050000 {
+				status = "okay";
+				fsl,lradc-touchscreen-wires = <4>;
+			};
+
 			pwm: pwm@80064000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <&pwm2_pins_a>;