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Add support for the GPIO-based backlight driver, which allows controlling display backlights connected via GPIO pins. This is commonly used on embedded boards and SBCs where a display backlight is toggled through a GPIO line rather than a dedicated backlight IC. Enables CONFIG_BACKLIGHT_GPIO. Signed-off-by: Matt Eaton <git@divinehawk.com> Link: https://github.com/openwrt/openwrt/pull/22740 Signed-off-by: Robert Marko <robimarko@gmail.com>