ARM: dts: vf610: Add edma mux Tx and Rx support for SAI node.

This patch adds the SAI's edma mux Tx and Rx support.
Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/vf610.dtsi

@@ -169,6 +169,9 @@ sai2: sai@40031000 {
 				interrupts = <0 86 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clks VF610_CLK_SAI2>;
 				clock-names = "sai";
+				dma-names = "tx", "rx";
+				dmas = <&edma0 0 21>,
+					<&edma0 0 20>;
 				status = "disabled";
 			};