dtb: xgene: Add channel property

Added 'channel' property, describing ethernet to CPU channel number.
Signed-off-by: NIyappan Subramanian <isubramanian@apm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/arm64/boot/dts/apm/apm-shadowcat.dtsi

@@ -653,6 +653,7 @@
 				     <0 113 4>,
 				     <0 114 4>,
 				     <0 115 4>;
+			channel = <12>;
 			port-id = <1>;
 			dma-coherent;
 			clocks = <&xge1clk 0>;

arch/arm64/boot/dts/apm/apm-storm.dtsi

@@ -993,6 +993,7 @@
 				     <0x0 0x65 0x4>,
 				     <0x0 0x66 0x4>,
 				     <0x0 0x67 0x4>;
+			channel = <0>;
 			dma-coherent;
 			clocks = <&xge0clk 0>;
 			/* mac address will be overwritten by the bootloader */