backlight: rave-sp-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/20240624152033.25016-17-tzimmermann@suse.deSigned-off-by: Lee Jones <lee@kernel.org>

drivers/video/backlight/rave-sp-backlight.c

@@ -19,7 +19,7 @@ static int rave_sp_backlight_update_status(struct backlight_device *bd)
 {
 	const struct backlight_properties *p = &bd->props;
 	const u8 intensity =
-		(p->power == FB_BLANK_UNBLANK) ? p->brightness : 0;
+		(p->power == BACKLIGHT_POWER_ON) ? p->brightness : 0;
 	struct rave_sp *sp = dev_get_drvdata(&bd->dev);
 	u8 cmd[] = {
 		[0] = RAVE_SP_CMD_SET_BACKLIGHT,