dt-bindings: net: mvneta: Add marvell,armada-ac5-neta

The out of band port on the 98DX2530 SoC is similar to the armada-3700
except it requires a slightly different MBUS window configuration. Add a
new compatible string so this difference can be accounted for.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Documentation/devicetree/bindings/net/marvell-armada-370-neta.txt

@@ -5,6 +5,7 @@ Required properties:
 	"marvell,armada-370-neta"
 	"marvell,armada-xp-neta"
 	"marvell,armada-3700-neta"
+	"marvell,armada-ac5-neta"
 - reg: address and length of the register set for the device.
 - interrupts: interrupt for the device
 - phy: See ethernet.txt file in the same directory.