exynos: dts: Add display-related device tree fragments

Bring in device tree pieces related to display from Linux 4.4 for:

- snow
- peach_pit
- peach_pi
- spring

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/dts/exynos54xx.dtsi b/arch/arm/dts/exynos54xx.dtsi
index be99a82..b4ddf53 100644
--- a/arch/arm/dts/exynos54xx.dtsi
+++ b/arch/arm/dts/exynos54xx.dtsi
@@ -49,7 +49,7 @@
 		status = "disabled";
 	};
 
-	i2c@12CA0000 {
+	hsi2c_4: i2c@12CA0000 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 		compatible = "samsung,exynos5-hsi2c";
@@ -178,7 +178,7 @@
 		samsung,pwm-out-gpio = <&gpb2 0 GPIO_ACTIVE_HIGH>;
 	};
 
-	dp@145b0000 {
+	dp: dp@145b0000 {
 		samsung,lt-status = <0>;
 
 		samsung,master-mode = <0>;