staging: fbtft: 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: Greg Kroah-Hartman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/fbtft/fb_ssd1351.c

···
 	struct backlight_properties bl_props = { 0, };
 
 	bl_props.type = BACKLIGHT_RAW;
-	bl_props.power = FB_BLANK_POWERDOWN;
+	bl_props.power = BACKLIGHT_POWER_OFF;
 
 	bd = backlight_device_register(dev_driver_string(par->info->device),
 				       par->info->device, par, &bl_ops,

drivers/staging/fbtft/fbtft-core.c

···
 void fbtft_unregister_backlight(struct fbtft_par *par)
 {
 	if (par->info->bl_dev) {
-		par->info->bl_dev->props.power = FB_BLANK_POWERDOWN;
+		par->info->bl_dev->props.power = BACKLIGHT_POWER_OFF;
 		backlight_update_status(par->info->bl_dev);
 		backlight_device_unregister(par->info->bl_dev);
 		par->info->bl_dev = NULL;
···
 
 	bl_props.type = BACKLIGHT_RAW;
 	/* Assume backlight is off, get polarity from current state of pin */
-	bl_props.power = FB_BLANK_POWERDOWN;
+	bl_props.power = BACKLIGHT_POWER_OFF;
 	if (!gpiod_get_value(par->gpio.led[0]))
 		par->polarity = true;
 
···
 
 	/* Turn on backlight if available */
 	if (fb_info->bl_dev) {
-		fb_info->bl_dev->props.power = FB_BLANK_UNBLANK;
+		fb_info->bl_dev->props.power = BACKLIGHT_POWER_ON;
 		fb_info->bl_dev->ops->update_status(fb_info->bl_dev);
 	}