ARM: dts: Add ADC's dt data to read raw data for exynos4x12

This patch add ADC(Analog to Digital Converter)'s dt data to get raw data
with IIO subsystem. Usually, ADC is used to check temperature, jack type
and so on.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos4x12.dtsi

@@ -80,6 +80,18 @@
 		};
 	};
 
+	adc: adc@126C0000 {
+		compatible = "samsung,exynos-adc-v1";
+		reg = <0x126C0000 0x100>, <0x10020718 0x4>;
+		interrupt-parent = <&combiner>;
+		interrupts = <10 3>;
+		clocks = <&clock CLK_TSADC>;
+		clock-names = "adc";
+		#io-channel-cells = <1>;
+		io-channel-ranges;
+		status = "disabled";
+	};
+
 	pinctrl_2: pinctrl@03860000 {
 		compatible = "samsung,exynos4x12-pinctrl";
 		reg = <0x03860000 0x1000>;