ASoC: dt-bindings: wm8974: Convert to dtschema

Convert WM8974 audio CODEC bindings from text to dtschema.
Signed-off-by: Kartik Agarwala <agarwala.kartik@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240325181943.116733-1-agarwala.kartik@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/wlf,wm8974.txt

-WM8974 audio CODEC
-
-This device supports both I2C and SPI (configured with pin strapping
-on the board).
-
-Required properties:
-  - compatible: "wlf,wm8974"
-  - reg: the I2C address or SPI chip select number of the device
-
-Examples:
-
-codec: wm8974@1a {
-	compatible = "wlf,wm8974";
-	reg = <0x1a>;
-};

Documentation/devicetree/bindings/sound/wlf,wm8974.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/wlf,wm8974.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: WM8974 audio CODEC
+
+maintainers:
+  - patches@opensource.cirrus.com
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: wlf,wm8974
+
+  reg:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        codec@1a {
+            compatible = "wlf,wm8974";
+            reg = <0x1a>;
+        };
+    };