ARM: dts: mvebu: fix cpus section indentation

Align the cpu node indentation with the rest of the file

[gc]: added a commit description
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/armada-xp-mv78460.dtsi

@@ -300,4 +300,4 @@ pcie@10,0 {
 			};
 		};
 	};
- };
+};