ASoC: ak4613: Undo conversion to YAML bindings

Revert 5b235b55 ("ASoC: dt-bindings: ak4613: switch to yaml base
Documentation") for the time being since it depends on other conversions.
Reported-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ak4613.txt

+AK4613 I2C transmitter
+
+This device supports I2C mode only.
+
+Required properties:
+
+- compatible : "asahi-kasei,ak4613"
+- reg : The chip select number on the I2C bus
+
+Optional properties:
+- asahi-kasei,in1-single-end	: Boolean. Indicate input / output pins are single-ended.
+- asahi-kasei,in2-single-end	  rather than differential.
+- asahi-kasei,out1-single-end
+- asahi-kasei,out2-single-end
+- asahi-kasei,out3-single-end
+- asahi-kasei,out4-single-end
+- asahi-kasei,out5-single-end
+- asahi-kasei,out6-single-end
+
+Example:
+
+&i2c {
+	ak4613: ak4613@10 {
+		compatible = "asahi-kasei,ak4613";
+		reg = <0x10>;
+	};
+};

Documentation/devicetree/bindings/sound/ak4613.yaml

-# SPDX-License-Identifier: GPL-2.0
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/sound/ak4613.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: AK4613 I2C transmitter Device Tree Bindings
-
-maintainers:
-  - Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
-
-properties:
-  compatible:
-    const: asahi-kasei,ak4613
-
-  reg:
-    maxItems: 1
-
-  clocks:
-    maxItems: 1
-
-  "#sound-dai-cells":
-    const: 0
-
-  # for OF-graph
-  port:
-    $ref: "audio-graph-card.yaml#definitions/port"
-  ports:
-    $ref: "audio-graph-card.yaml#definitions/ports"
-
-# use patternProperties to avoid naming "xxx,yyy" issue
-patternProperties:
-  "^asahi-kasei,in1-single-end$":
-    $ref: /schemas/types.yaml#/definitions/flag
-  "^asahi-kasei,in2-single-end$":
-    $ref: /schemas/types.yaml#/definitions/flag
-  "^asahi-kasei,out1-single-end$":
-    $ref: /schemas/types.yaml#/definitions/flag
-  "^asahi-kasei,out2-single-end$":
-    $ref: /schemas/types.yaml#/definitions/flag
-  "^asahi-kasei,out3-single-end$":
-    $ref: /schemas/types.yaml#/definitions/flag
-  "^asahi-kasei,out4-single-end$":
-    $ref: /schemas/types.yaml#/definitions/flag
-  "^asahi-kasei,out5-single-end$":
-    $ref: /schemas/types.yaml#/definitions/flag
-  "^asahi-kasei,out6-single-end$":
-    $ref: /schemas/types.yaml#/definitions/flag
-
-required:
-  - compatible
-  - reg
-
-additionalProperties: false
-
-examples:
-  - |
-    i2c {
-        #address-cells = <1>;
-        #size-cells = <0>;
-        ak4613: codec@10 {
-            compatible = "asahi-kasei,ak4613";
-            reg = <0x10>;
-        };
-    };