backlight: pwm-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/20240624152033.25016-16-tzimmermann@suse.deSigned-off-by: Lee Jones <lee@kernel.org>

drivers/video/backlight/pwm_bl.c

@@ -426,7 +426,7 @@ static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)
 
 	/* Not booted with device tree or no phandle link to the node */
 	if (!node || !node->phandle)
-		return FB_BLANK_UNBLANK;
+		return BACKLIGHT_POWER_ON;
 
 	/*
 	 * If the driver is probed from the device tree and there is a
@@ -434,7 +434,7 @@ static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)
 	 * assume that another driver will enable the backlight at the
 	 * appropriate time. Therefore, if it is disabled, keep it so.
 	 */
-	return active ? FB_BLANK_UNBLANK: FB_BLANK_POWERDOWN;
+	return active ? BACKLIGHT_POWER_ON : BACKLIGHT_POWER_OFF;
 }
 
 static int pwm_backlight_probe(struct platform_device *pdev)