ASoC: dt-bindings: ti,pcm1681: Convert to dtschema

Convert the Texas Instruments PCM1681 bindings to DT schema.
Make bindings complete by adding #sound-dai-cells.
Signed-off-by: Animesh Agarwal <animeshagarwal28@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://msgid.link/r/20240406141454.45529-1-animeshagarwal28@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ti,pcm1681.txt

-Texas Instruments PCM1681 8-channel PWM Processor
-
-Required properties:
-
- - compatible:		Should contain "ti,pcm1681".
- - reg:			The i2c address. Should contain <0x4c>.
-
-Examples:
-
-	i2c_bus {
-		pcm1681@4c {
-			compatible = "ti,pcm1681";
-			reg = <0x4c>;
-		};
-	};

Documentation/devicetree/bindings/sound/ti,pcm1681.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/ti,pcm1681.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments PCM1681 8-channel PWM Processor
+
+maintainers:
+  - Shenghao Ding <shenghao-ding@ti.com>
+  - Kevin Lu <kevin-lu@ti.com>
+  - Baojun Xu <baojun.xu@ti.com>
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: ti,pcm1681
+
+  reg:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pcm1681: audio-codec@4c {
+            compatible = "ti,pcm1681";
+            reg = <0x4c>;
+        };
+    };