ASoC: dt-bindings: cirrus,cs4270: Convert to dtschema

Convert the Cirrus Logic CS4270 audio CODEC bindings to DT schema. Add
missing va-supply, vd-supply and vlc-supply properties, because they
are already being used in the DTS and the driver for this device.

Cc: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Animesh Agarwal <animeshagarwal28@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240709184231.125207-1-animeshagarwal28@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/cirrus,cs4270.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/cirrus,cs4270.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cirrus Logic CS4270 audio CODEC
+
+maintainers:
+  - patches@opensource.cirrus.com
+
+description:
+  The CS4270 is a stereo audio codec. The driver for this device currently only
+  supports I2C.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: cirrus,cs4270
+
+  reg:
+    maxItems: 1
+
+  '#sound-dai-cells':
+    const: 0
+
+  reset-gpios:
+    description:
+      This pin will be deasserted before communication to the codec starts.
+    maxItems: 1
+
+  va-supply:
+    description: Analog power supply.
+
+  vd-supply:
+    description: Digital power supply.
+
+  vlc-supply:
+    description: Serial Control Port power supply.
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      codec@48 {
+          compatible = "cirrus,cs4270";
+          reg = <0x48>;
+      };
+    };

Documentation/devicetree/bindings/sound/cs4270.txt

-CS4270 audio CODEC
-
-The driver for this device currently only supports I2C.
-
-Required properties:
-
-  - compatible : "cirrus,cs4270"
-
-  - reg : the I2C address of the device for I2C
-
-Optional properties:
-
-  - reset-gpios : a GPIO spec for the reset pin. If specified, it will be
-		  deasserted before communication to the codec starts.
-
-Example:
-
-codec: cs4270@48 {
-	compatible = "cirrus,cs4270";
-	reg = <0x48>;
-};