ARM: dts: Add labels to exynos5 nodes

Add new labels to certain nodes so they could be easily referenced by
Exynos5 board DTS files.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/exynos5.dtsi

@@ -81,14 +81,14 @@ serial_3: serial@12C30000 {
 		interrupts = <0 54 0>;
 	};
 
-	rtc@101E0000 {
+	rtc: rtc@101E0000 {
 		compatible = "samsung,s3c6410-rtc";
 		reg = <0x101E0000 0x100>;
 		interrupts = <0 43 0>, <0 44 0>;
 		status = "disabled";
 	};
 
-	fimd@14400000 {
+	fimd: fimd@14400000 {
 		compatible = "samsung,exynos5250-fimd";
 		interrupt-parent = <&combiner>;
 		reg = <0x14400000 0x40000>;
@@ -98,7 +98,7 @@ fimd@14400000 {
 		status = "disabled";
 	};
 
-	dp-controller@145B0000 {
+	dp: dp-controller@145B0000 {
 		compatible = "samsung,exynos5-dp";
 		reg = <0x145B0000 0x1000>;
 		interrupts = <10 3>;

arch/arm/boot/dts/exynos5440.dtsi

@@ -279,7 +279,7 @@ ehci@221000 {
 		clock-names = "usbhost";
 	};
 
-	pcie@290000 {
+	pcie_0: pcie@290000 {
 		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
 		reg = <0x290000 0x1000
 			0x270000 0x1000
@@ -300,7 +300,7 @@ pcie@290000 {
 		status = "disabled";
 	};
 
-	pcie@2a0000 {
+	pcie_1: pcie@2a0000 {
 		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
 		reg = <0x2a0000 0x1000
 			0x272000 0x1000