ARM: ls1021a: Add dma-coherent property for eTSEC nodes

This patch adds dma-coherent property for eTSEC nodes, so
coherent DMA operations are supported.
Signed-off-by: Alison Wang <alison.wang@freescale.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a.dtsi

@@ -445,6 +445,7 @@ enet0: ethernet@2d10000 {
 			model = "eTSEC";
 			fsl,magic-packet;
 			ranges;
+			dma-coherent;
 
 			queue-group@2d10000 {
 				#address-cells = <2>;
@@ -473,6 +474,7 @@ enet1: ethernet@2d50000 {
 			interrupt-parent = <&gic>;
 			model = "eTSEC";
 			ranges;
+			dma-coherent;
 
 			queue-group@2d50000  {
 				#address-cells = <2>;
@@ -501,6 +503,7 @@ enet2: ethernet@2d90000 {
 			interrupt-parent = <&gic>;
 			model = "eTSEC";
 			ranges;
+			dma-coherent;
 
 			queue-group@2d90000  {
 				#address-cells = <2>;