ARM: orion5x: add interrupt for Ethernet in Device Tree

For some reason, the Ethernet interrupt was missing in the Orion5x
Device Tree definition.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1398202002-28530-20-git-send-email-thomas.petazzoni@free-electrons.com
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/orion5x.dtsi

@@ -128,6 +128,7 @@
 				ethport: ethernet-port@0 {
 					compatible = "marvell,orion-eth-port";
 					reg = <0>;
+					interrupts = <21>;
 					/* overwrite MAC address in bootloader */
 					local-mac-address = [00 00 00 00 00 00];
 					/* set phy-handle property in board file */