backlight: ktd253-backlight: Use backlight power constants

Replace FB_BLANK_ constants with their counterparts from the
backlight subsystem. The values are identical, so there's no
change in functionality.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20240624152033.25016-10-tzimmermann@suse.deSigned-off-by: Lee Jones <lee@kernel.org>

drivers/video/backlight/ktd253-backlight.c

@@ -7,7 +7,6 @@
 #include <linux/backlight.h>
 #include <linux/delay.h>
 #include <linux/err.h>
-#include <linux/fb.h>
 #include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -190,10 +189,10 @@ static int ktd253_backlight_probe(struct platform_device *pdev)
 	/* When we just enable the GPIO line we set max brightness */
 	if (brightness) {
 		bl->props.brightness = brightness;
-		bl->props.power = FB_BLANK_UNBLANK;
+		bl->props.power = BACKLIGHT_POWER_ON;
 	} else {
 		bl->props.brightness = 0;
-		bl->props.power = FB_BLANK_POWERDOWN;
+		bl->props.power = BACKLIGHT_POWER_OFF;
 	}
 
 	ktd253->bl = bl;