pwm_backlight: Validate dft_brightness in main probe function
Move the dft_brightness validity check from the DT parsing function to the main probe. In this way we can validate it in case we are booting with or without DT. Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>
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