ASoC: dt-bindings: nau8822: convert to the dtschema

Convert nau8822 devicetree binding to dtschema.
Change file name to match dtschema naming.

Cc: David Lin <CTLIN0@nuvoton.com>
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230104140412.35575-2-francesco@dolcini.itSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/nau8822.txt

-NAU8822 audio CODEC
-
-This device supports I2C only.
-
-Required properties:
-
-  - compatible : "nuvoton,nau8822"
-
-  - reg : the I2C address of the device.
-
-Example:
-
-codec: nau8822@1a {
-	compatible = "nuvoton,nau8822";
-	reg = <0x1a>;
-};

Documentation/devicetree/bindings/sound/nuvoton,nau8822.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/nuvoton,nau8822.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NAU8822 audio CODEC
+
+description: |
+  24 bit stereo audio codec with speaker driver.
+  This device supports I2C/SPI.
+
+maintainers:
+  - David Lin <CTLIN0@nuvoton.com>
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,nau8822
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        codec@1a {
+            compatible = "nuvoton,nau8822";
+            reg = <0x1a>;
+        };
+    };