ASoC: mediatek: mt6358: add new compatible for using mt6366

Add new compatible string "mediatek,mt6366-sound" for using mt6366.
Signed-off-by: NJiaxin Yu <jiaxin.yu@mediatek.com>
Acked-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220718162204.26238-2-jiaxin.yu@mediatek.comSigned-off-by: NMark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/mt6358.txt

@@ -7,7 +7,9 @@ Must be a child node of PMIC wrapper.
 
 Required properties:
 
-- compatible : "mediatek,mt6358-sound".
+- compatible - "string" - One of:
+    "mediatek,mt6358-sound"
+    "mediatek,mt6366-sound"
 - Avdd-supply : power source of AVDD
 
 Optional properties: