staging: olpc_dcon: 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 <tzimmermann@suse.de>
Cc: Jens Frederich <jfrederich@gmail.com>
Cc: Jon Nettleton <jon.nettleton@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20240731130130.1148153-3-tzimmermann@suse.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/olpc_dcon/olpc_dcon.c

@@ -544,7 +544,7 @@ static const struct backlight_ops dcon_bl_ops = {
 static struct backlight_properties dcon_bl_props = {
 	.max_brightness = 15,
 	.type = BACKLIGHT_RAW,
-	.power = FB_BLANK_UNBLANK,
+	.power = BACKLIGHT_POWER_ON,
 };
 
 static int dcon_reboot_notify(struct notifier_block *nb,