dt-bindings: leds: Add NCP5623 multi-LED Controller

NCP5623 is DC-DC multi-LED controller which can be used for RGB
illumination or backlight LCD display.

Signed-off-by: Abdel Alkuor <alkuor@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240305042049.1533279-1-alkuor@gmail.com


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