ASoC: dt-bindings: simple-card: correct DAI subnodes pattern

The simple-audio-card,dai-link node does not allow address/size-cells
thus children (cpu, codec) should come without unit addresses.  For
cases with multiple nodes of same type, require a dash before index
(e.g. cpu-x) and add trailing $ to the pattern to disallow other
characters.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230109083301.76282-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

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

@@ -244,9 +244,9 @@ patternProperties:
         maxItems: 1
 
     patternProperties:
-      "^cpu(@[0-9a-f]+)?":
+      "^cpu(-[0-9]+)?$":
         $ref: "#/definitions/dai"
-      "^codec(@[0-9a-f]+)?":
+      "^codec(-[0-9]+)?$":
         $ref: "#/definitions/dai"
     additionalProperties: false
 
@@ -462,16 +462,16 @@ examples:
 
             convert-channels = <8>; /* TDM Split */
 
-            sndcpu1: cpu0 {
+            sndcpu1: cpu-0 {
                 sound-dai = <&rcar_sound 1>;
             };
-            cpu1 {
+            cpu-1 {
                 sound-dai = <&rcar_sound 2>;
             };
-            cpu2 {
+            cpu-2 {
                 sound-dai = <&rcar_sound 3>;
             };
-            cpu3 {
+            cpu-3 {
                 sound-dai = <&rcar_sound 4>;
             };
             codec {