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Add the display backlight for the Asurada platform. It relies on the
display PWM controller, so also enable and configure this component.
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20221102190611.283546-3-nfraprado@collabora.com

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>