ASoC: simple-card: fix simple card widgets routing property name usage

Fix the usage of simple card widgets routing property, and make it the
same with simple card routing property name.

Signed-off-by: Xiubo Li <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/simple-card.txt

···
 sound {
 	compatible = "simple-audio-card";
 	simple-audio-card,format = "left_j";
-	simple-audio-routing =
+	simple-audio-card,routing =
 		"MIC_IN", "Mic Jack",
 		"Headphone Jack", "HP_OUT",
 		"Ext Spk", "LINE_OUT";