disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/pwm_backlight.h
..
..
@@ -16,8 +16,6 @@
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 	unsigned int *levels;
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 	unsigned int post_pwm_on_delay;
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 	unsigned int pwm_off_delay;
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-	/* TODO remove once all users are switched to gpiod_* API */
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-	int enable_gpio;
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 	int (*init)(struct device *dev);
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 	int (*notify)(struct device *dev, int brightness);
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 	void (*notify_after)(struct device *dev, int brightness);