ARM: dts: Add node for touchscreen for exynos4210-trats

This patch adds a device tree node for the Melfas MMS114-controlled
touchscreen present on Samsung Trats board.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos4210-trats.dts

@@ -114,6 +114,17 @@ i2c@13890000 {
 		pinctrl-0 = <&i2c3_bus>;
 		pinctrl-names = "default";
 		status = "okay";
+
+		mms114-touchscreen@48 {
+			compatible = "melfas,mms114";
+			reg = <0x48>;
+			interrupt-parent = <&gpx0>;
+			interrupts = <4 2>;
+			x-size = <720>;
+			y-size = <1280>;
+			avdd-supply = <&tsp_reg>;
+			vdd-supply = <&tsp_reg>;
+		};
 	};
 
 	i2c@138B0000 {