arm64: dts: marvell: mcbin: enable the mdio node

Since the mdio nodes are disabled by default now, we should explicitly
enable these nodes at the board level when they are used. Enable the
cpm_mdio node for the 8040-mcbin.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts

@@ -116,6 +116,8 @@
 };
 
 &cpm_mdio {
+	status = "okay";
+
 	ge_phy: ethernet-phy@0 {
 		reg = <0>;
 	};