ARM: dts: add pin state information for DP HPD support to Exynos5250

Add pin state information for DP HPD support that requires
pin configuration support using pinctrl interface.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250-pinctrl.dtsi

@@ -553,6 +553,13 @@ uart1_fctl: uart1-fctl {
 			samsung,pin-pud = <0>;
 			samaung,pin-drv = <0>;
 		};
+
+		dp_hpd: dp_hpd {
+			samsung,pins = "gpx0-7";
+			samsung,pin-function = <3>;
+			samsung,pin-pud = <0>;
+			samaung,pin-drv = <0>;
+		};
 	};
 
 	pinctrl@13400000 {

arch/arm/boot/dts/exynos5250-smdk5250.dts

@@ -224,6 +224,9 @@ dp-controller {
 		samsung,color-depth = <1>;
 		samsung,link-rate = <0x0a>;
 		samsung,lane-count = <4>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&dp_hpd>;
 	};
 
 	display-timings {