ARM: dts: at91: tse850: make the sound dai cell count explicit

The node is referred to as a DAI from the sound node and should
therefore have a #sound-dai-cells property.

Fixes: 21dd0ece ("ARM: dts: at91: add devicetree for the Axentia TSE-850")
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/at91-tse850-3.dts

@@ -234,6 +234,7 @@ pcm5142: pcm5142@4c {
 		compatible = "ti,pcm5142";
 
 		reg = <0x4c>;
+		#sound-dai-cells = <0>;
 
 		AVDD-supply = <&reg_3v3>;
 		DVDD-supply = <&reg_3v3>;