ARM: dts: omap: remove unneeded unit name for sound nodes

This patch fixes the following DTC warning:

"sound@0 has a unit name, but no reg property"

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Signed-off-by: Tony Lindgren <[e-mail]>

arch/arm/boot/dts/am437x-gp-evm.dts

···
 		clock-frequency = <32768>;
 	};
 
-	sound0: sound@0 {
+	sound0: sound0 {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "AM437x-GP-EVM";
 		simple-audio-card,widgets =

arch/arm/boot/dts/am43x-epos-evm.dts

···
 		default-brightness-level = <8>;
 	};
 
-	sound0: sound@0 {
+	sound0: sound0 {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "AM43-EPOS-EVM";
 		simple-audio-card,widgets =

arch/arm/boot/dts/am57xx-beagle-x15.dts

···
 		};
 	};
 
-	sound0: sound@0 {
+	sound0: sound0 {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "BeagleBoard-X15";
 		simple-audio-card,widgets =

arch/arm/boot/dts/am57xx-cl-som-am57x.dts

···
 		regulator-max-microvolt = <3300000>;
 	};
 
-	sound0: sound@0 {
+	sound0: sound0 {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "CL-SOM-AM57x-Sound-Card";
 		simple-audio-card,format = "i2s";

arch/arm/boot/dts/dra7-evm.dts

···
 		gpio = <&gpio7 11 GPIO_ACTIVE_HIGH>;
 	};
 
-	sound0: sound@0 {
+	sound0: sound0 {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "DRA7xx-EVM";
 		simple-audio-card,widgets =

arch/arm/boot/dts/dra72-evm.dts

···
 		};
 	};
 
-	sound0: sound@0 {
+	sound0: sound0 {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "DRA7xx-EVM";
 		simple-audio-card,widgets =

arch/arm/boot/dts/omap4-var-som-om44.dtsi

···
 		reg = <0x80000000 0x40000000>; /* 1 GB */
 	};
 
-	sound: sound@0 {
+	sound: sound {
 		compatible = "ti,abe-twl6040";
 		ti,model = "VAR-SOM-OM44";