dt-bindings: media: rockchip: Add resets property into decoder node

RK3588 AV1 decoder hardware block have resets lines and driver code
already suppport it.
Update yaml file to be aligned with this feature.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>

Documentation/devicetree/bindings/media/rockchip-vpu.yaml

@@ -68,6 +68,9 @@ properties:
   iommus:
     maxItems: 1
 
+  resets:
+    maxItems: 4
+
 required:
   - compatible
   - reg