dt-bindings: media: Add compatible for Meson-S4 IR Controller

Add new compatible for Amlogic's Meson-S4 IR Controller.
Meson IR Controller supports hardware decoder in Meson-S4 and later SoC.

Signed-off-by: Zelong Dong <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Sean Young <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

Documentation/devicetree/bindings/media/amlogic,meson6-ir.yaml

···
           - amlogic,meson6-ir
           - amlogic,meson8b-ir
           - amlogic,meson-gxbb-ir
+          - amlogic,meson-s4-ir
       - items:
           - const: amlogic,meson-gx-ir
           - const: amlogic,meson-gxbb-ir