arm: dts: Set custom names for cp110 master/slave MDIO buses

Implicitly Marvell MDIO driver uses DT node names for devices, but in this
case that is not unique.  Set MDIO device names for master/slave to
cpm/cps.

Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/arch/arm/dts/armada-cp110-slave.dtsi b/arch/arm/dts/armada-cp110-slave.dtsi
index 2ea9004..2fbd7b5 100644
--- a/arch/arm/dts/armada-cp110-slave.dtsi
+++ b/arch/arm/dts/armada-cp110-slave.dtsi
@@ -96,6 +96,7 @@
 				#size-cells = <0>;
 				compatible = "marvell,orion-mdio";
 				reg = <0x12a200 0x10>;
+				device-name = "cps-mdio";
 			};
 
 			cps_syscon0: system-controller@440000 {