ARM: dts: dove: Add node labels for PCIe ports 0 and 1

Add pcie[01] node labels to allow to reference them easily from
board level.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/dove.dtsi

@@ -64,7 +64,7 @@ pcie: pcie-controller {
 				  0x82000000 0x2 0x0 MBUS_ID(0x08, 0xe8) 0 1 0   /* Port 1.0 Mem */
 				  0x81000000 0x2 0x0 MBUS_ID(0x08, 0xe0) 0 1 0>; /* Port 1.0 I/O */
 
-			pcie-port@0 {
+			pcie0: pcie-port@0 {
 				device_type = "pci";
 				status = "disabled";
 				assigned-addresses = <0x82000800 0 0x40000 0 0x2000>;
@@ -82,7 +82,7 @@ pcie-port@0 {
 				interrupt-map = <0 0 0 0 &intc 16>;
 			};
 
-			pcie-port@1 {
+			pcie1: pcie-port@1 {
 				device_type = "pci";
 				status = "disabled";
 				assigned-addresses = <0x82002800 0 0x80000 0 0x2000>;