dt-bindings: mfd: mediatek: mt6397: Add accdet subnode

Describe the accdet as a possible subnode of the MT6359 PMIC.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>

Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml

@@ -224,6 +224,13 @@ properties:
     description:
       Pin controller
 
+  accdet:
+    type: object
+    $ref: /schemas/sound/mediatek,mt6359-accdet.yaml
+    unevaluatedProperties: false
+    description:
+      Accessory Detection
+
 required:
   - compatible
   - regulators