ARM: dts: armada-375: Fixup pcie DT warnings

PCIe has a range property, so the unit name should contain an address.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-375.dtsi

@@ -580,7 +580,7 @@ coredivclk: corediv-clock@e8250 {
 			};
 		};
 
-		pciec: pcie-controller {
+		pciec: pcie-controller@82000000 {
 			compatible = "marvell,armada-370-pcie";
 			status = "disabled";
 			device_type = "pci";