ASoC: dt-bindings: everest,es8326: Document interrupt property

The ES8326 audio codec has one interrupt pin for headset detection
according to the datasheet. Document that in the binding.

This fixes dtbs_check error:
  'interrupts-extended' does not match any of the regexes:
  'pinctrl-[0-9]+'

Signed-off-by: Fei Shao <fshao@chromium.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20241105091910.3984381-1-fshao@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Fei Shao

Documentation/devicetree/bindings/sound/everest,es8326.yaml

@@ -24,6 +24,10 @@ properties:
     items:
       - const: mclk
 
+  interrupts:
+    maxItems: 1
+    description: interrupt output for headset detection
+
   "#sound-dai-cells":
     const: 0