ARM: dts: exynos/dp: remove some properties that deprecated by analogix_dp driver

After exynos_dp have been split the common IP code into analogix_dp driver,
the analogix_dp driver have deprecated some Samsung platform properties which
could be dynamically parsed from EDID/MODE/DPCD message, so this is an update
for Exynos DTS file for dp-controller.

Beside the backward compatibility is fully preserved, so there are no
bisectability break that make this change in a separate patch.

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>
diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
index 35cfb07..2f37c87 100644
--- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
+++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts
@@ -148,12 +148,10 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&dp_hpd_gpio>;
 	samsung,color-space = <0>;
-	samsung,dynamic-range = <0>;
-	samsung,ycbcr-coeff = <0>;
 	samsung,color-depth = <1>;
 	samsung,link-rate = <0x06>;
 	samsung,lane-count = <2>;
-	samsung,hpd-gpio = <&gpx2 6 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx2 6 GPIO_ACTIVE_HIGH>;
 
 	ports {
 		port@0 {