arm64: dts: ti: j721e-common-proc-board: Fix sound node-name

If root-node has no reg property, the unit-address should not
be appended at the end of node-name. 'sound' node has no 'reg'
property, so remove the unit-address.
Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jai Luthra <j-luthra@ti.com>
Link: https://lore.kernel.org/r/20220928122509.143342-1-j-choudhary@ti.com

arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts

@@ -96,7 +96,7 @@ vdd_sd_dv_alt: gpio-regulator-TLV71033 {
 			 <3300000 0x1>;
 	};
 
-	sound0: sound@0 {
+	sound0: sound-0 {
 		compatible = "ti,j721e-cpb-audio";
 		model = "j721e-cpb";