ARM: dts: imx6dl-b1x5pv2: Fix simple-audio routing property

Per simple-card.yaml, 'simple-audio-card,audio-routing' is not a valid
property.

Change it to 'simple-audio-card,routing'.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: Fabio Estevam

arch/arm/boot/dts/nxp/imx/imx6dl-b1x5pv2.dtsi

@@ -257,7 +257,7 @@
 		simple-audio-card,bitclock-master = <&dailink_master>;
 		simple-audio-card,frame-master = <&dailink_master>;
 		simple-audio-card,widgets = "Speaker", "Ext Spk";
-		simple-audio-card,audio-routing = "Ext Spk", "LINE";
+		simple-audio-card,routing = "Ext Spk", "LINE";
 
 		simple-audio-card,cpu {
 			sound-dai = <&ssi1>;