dt-bindings: pwm: Add interrupts property for MediaTek MT8192

Add interrupts property of pwm for MediaTek MT8192 SoC.
Signed-off-by: Xinlei Lee <xinlei.lee@mediatek.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml

@@ -37,6 +37,9 @@ properties:
   "#pwm-cells":
     const: 2
 
+  interrupts:
+    maxItems: 1
+
   clocks:
     items:
       - description: Main Clock