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>
diff --git a/arch/arm/boot/dts/exynos5440.dtsi b/arch/arm/boot/dts/exynos5440.dtsi
index 59d9416..f18b51f 100644
--- a/arch/arm/boot/dts/exynos5440.dtsi
+++ b/arch/arm/boot/dts/exynos5440.dtsi
@@ -279,7 +279,7 @@
 		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 @@
 		status = "disabled";
 	};
 
-	pcie@2a0000 {
+	pcie_1: pcie@2a0000 {
 		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
 		reg = <0x2a0000 0x1000
 			0x272000 0x1000