fbdev: sh_mobile_lcdc_fb: 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: Helge Deller <[e-mail]>
Reviewed-by: Jani Nikula <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/sh_mobile_lcdcfb.c

···
 		sh_mobile_lcdc_display_on(ch);
 
 		if (ch->bl) {
-			ch->bl->props.power = FB_BLANK_UNBLANK;
+			ch->bl->props.power = BACKLIGHT_POWER_ON;
 			backlight_update_status(ch->bl);
 		}
 	}
···
 		}
 
 		if (ch->bl) {
-			ch->bl->props.power = FB_BLANK_POWERDOWN;
+			ch->bl->props.power = BACKLIGHT_POWER_OFF;
 			backlight_update_status(ch->bl);
 		}
 
···
 	struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
 	int brightness = bdev->props.brightness;
 
-	if (bdev->props.power != FB_BLANK_UNBLANK ||
+	if (bdev->props.power != BACKLIGHT_POWER_ON ||
 	    bdev->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
 		brightness = 0;