Convert the MediaTek MT6358 Audio CODEC bindings to DT schema.

This change implements the following updates:
1. Compatible property: Added the const 'mediatek,mt6358-sound'
   to ensure alignment with the schema in the actual (DTS) file
   "mt8186-corsola.dtsi" with 'mediatek,mt6366-sound'.
2. Example: Removed the example section, as it should be relocated to
   the MT6397 PMIC file 'mfd/mediatek,mt6397.yaml'.

Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
---
 .../devicetree/bindings/sound/mt6358.txt      | 26 ------------
 .../devicetree/bindings/sound/mt6358.yaml     | 41 +++++++++++++++++++
 2 files changed, 41 insertions(+), 26 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/sound/mt6358.txt
 create mode 100644 Documentation/devicetree/bindings/sound/mt6358.yaml

Changess for v1~v6:
 - It was not in the origin patch set.

Changes for v7:
 - It is seperated from the origin patch set (2/2, v6).
   It could simplifies the audio-codec node in next patch (3/3, v7)
   of 'mfd/mediatek,mt6397.yaml'

diff --git a/Documentation/devicetree/bindings/sound/mt6358.txt b/Documentation/devicetree/bindings/sound/mt6358.txt
deleted file mode 100644
index fbe9e55c68f5..000000000000
--- a/Documentation/devicetree/bindings/sound/mt6358.txt
+++ /dev/null

@@ -1,26 +0,0 @@
-Mediatek MT6358 Audio Codec
-
-The communication between MT6358 and SoC is through Mediatek PMIC wrapper.
-For more detail, please visit Mediatek PMIC wrapper documentation.
-
-Must be a child node of PMIC wrapper.
-
-Required properties:
-
-- compatible - "string" - One of:
-    "mediatek,mt6358-sound"
-    "mediatek,mt6366-sound"
-- Avdd-supply : power source of AVDD
-
-Optional properties:
-- mediatek,dmic-mode : Indicates how many data pins are used to transmit two
-	channels of PDM signal. 0 means two wires, 1 means one wire. Default
-	value is 0.
-
-Example:
-
-mt6358_snd {
-	compatible = "mediatek,mt6358-sound";
-	Avdd-supply = <&mt6358_vaud28_reg>;
-	mediatek,dmic-mode = <0>;
-};

diff --git a/Documentation/devicetree/bindings/sound/mt6358.yaml b/Documentation/devicetree/bindings/sound/mt6358.yaml
new file mode 100644
index 000000000000..5f7611e26a89
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/mt6358.yaml

@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/mt6358.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek MT6358 Audio Codec
+
+maintainers:
+  - Jiaxin Yu <jiaxin.yu@mediatek.com>
+  - Macpaul Lin <macpaul.lin@mediatek.com>
+
+description: |
+  The communication between MT6358 and SoC is through Mediatek PMIC wrapper.
+  For more detail, please visit Mediatek PMIC wrapper documentation.
+  Must be a child node of PMIC wrapper.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt6366-sound
+      - mediatek,mt6358-sound
+    const: mediatek,mt6358-sound