ASoC: fsl: fix the binding of imx-sgtl5000

The sgtl5000 data sheet does not particularly mention that the Mic Bias
will internally supplies to MIC_IN, so fix the example in imx-sgtl5000
binding document to have a better reflection of the actual circuit.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

Documentation/devicetree/bindings/sound/imx-audio-sgtl5000.txt

@@ -41,8 +41,8 @@ sound {
 	ssi-controller = <&ssi1>;
 	audio-codec = <&sgtl5000>;
 	audio-routing =
+		"MIC_IN", "Mic Jack",
 		"Mic Jack", "Mic Bias",
-		"MIC_IN", "Mic Bias",
 		"Headphone Jack", "HP_OUT";
 	mux-int-port = <1>;
 	mux-ext-port = <3>;