ARM: dts: Add pin state information for DP HPD support to Exynos5420

Add pin state information for DP HPD support that requires pin configuration
support using pinctrl interface.
Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5420-pinctrl.dtsi

@@ -59,6 +59,13 @@ gpx3: gpx3 {
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		dp_hpd: dp_hpd {
+			samsung,pins = "gpx0-7";
+			samsung,pin-function = <3>;
+			samsung,pin-pud = <0>;
+			samaung,pin-drv = <0>;
+		};
 	};
 
 	pinctrl@13410000 {

arch/arm/boot/dts/exynos5420-smdk5420.dts

@@ -32,6 +32,8 @@ oscclk {
 	};
 
 	dp-controller@145B0000 {
+		pinctrl-names = "default";
+		pinctrl-0 = <&dp_hpd>;
 		samsung,color-space = <0>;
 		samsung,dynamic-range = <0>;
 		samsung,ycbcr-coeff = <0>;