dt-bindings: leds: Convert Panasonic AN30259A to DT schema

Convert the Panasonic AN30259A 3-channel LED controller binding to DT
schema format.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230724230258.1017258-1-robh@kernel.org


Signed-off-by: Lee Jones <lee@kernel.org>