dt-bindings: media: gpio-ir-receiver: Document wakeup-souce property

The GPIO IR receiver can be used as a wake-up source for the system,
document that.
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: NSean Young <sean@mess.org>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>

Documentation/devicetree/bindings/media/gpio-ir-receiver.yaml

@@ -23,6 +23,9 @@ properties:
     description: autosuspend delay time in milliseconds
     $ref: /schemas/types.yaml#/definitions/uint32
 
+  wakeup-source:
+    description: IR receiver can wake-up the system.
+
 required:
   - compatible
   - gpios