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 <[e-mail]>
Cc: Jens Frederich <[e-mail]>
Cc: Jon Nettleton <[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/olpc_dcon/olpc_dcon.c

···
 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,