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 <[e-mail]>
Reviewed-by: Daniel Thompson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/video/backlight/pwm_bl.c

···
 
 	/* 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
···
 	 * 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)