ARM: dtsi: imx6dl: Add a pinctrl for AUDMUX

Add a pinctrl for AUDMUX used on imx6dl-sabresd.
Signed-off-by: Nicolin Chen <b42378@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6dl.dtsi

@@ -35,6 +35,17 @@ iomuxc: iomuxc@020e0000 {
 				compatible = "fsl,imx6dl-iomuxc";
 				reg = <0x020e0000 0x4000>;
 
+				audmux {
+					pinctrl_audmux_2: audmux-2 {
+						fsl,pins = <
+							MX6DL_PAD_CSI0_DAT7__AUD3_RXD  0x80000000
+							MX6DL_PAD_CSI0_DAT4__AUD3_TXC  0x80000000
+							MX6DL_PAD_CSI0_DAT5__AUD3_TXD  0x80000000
+							MX6DL_PAD_CSI0_DAT6__AUD3_TXFS 0x80000000
+						>;
+					};
+				};
+
 				ecspi1 {
 					pinctrl_ecspi1_1: ecspi1grp-1 {
 						fsl,pins = <