dt-bindings: pwm: amlogic: Add optional power-domains

On newer SoCs, the PWM hardware can require a power domain to operate
so add corresponding optional property.
Signed-off-by: George Stark <gnstark@salutedevices.com>
Acked-by: Conor Dooley <conor@kernel.org>
Link: https://lore.kernel.org/r/20240710234116.2370655-2-gnstark@salutedevices.comSigned-off-by: Uwe Kleine-König <ukleinek@kernel.org>

Documentation/devicetree/bindings/pwm/pwm-amlogic.yaml

@@ -56,6 +56,9 @@ properties:
     minItems: 1
     maxItems: 2
 
+  power-domains:
+    maxItems: 1
+
   "#pwm-cells":
     const: 3