fbdev: atmel_lcdfb: 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 or semantics.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Cc: Nicolas Ferre <[e-mail]>
Cc: Helge Deller <[e-mail]>
Cc: Alexandre Belloni <[e-mail]>
Cc: Claudiu Beznea <[e-mail]>
Reviewed-by: Jani Nikula <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/atmel_lcdfb.c

···
 	}
 	sinfo->backlight = bl;
 
-	bl->props.power = FB_BLANK_UNBLANK;
+	bl->props.power = BACKLIGHT_POWER_ON;
 	bl->props.brightness = atmel_bl_get_brightness(bl);
 }
 
···
 		return;
 
 	if (sinfo->backlight->ops) {
-		sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
+		sinfo->backlight->props.power = BACKLIGHT_POWER_OFF;
 		sinfo->backlight->ops->update_status(sinfo->backlight);
 	}
 	backlight_device_unregister(sinfo->backlight);