fbdev: chipsfb: 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: Helge Deller <deller@gmx.de>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240731123502.1145082-5-tzimmermann@suse.de

drivers/video/fbdev/chipsfb.c

@@ -399,7 +399,7 @@ static int chipsfb_pci_init(struct pci_dev *dp, const struct pci_device_id *ent)
 	/* turn on the backlight */
 	mutex_lock(&pmac_backlight_mutex);
 	if (pmac_backlight) {
-		pmac_backlight->props.power = FB_BLANK_UNBLANK;
+		pmac_backlight->props.power = BACKLIGHT_POWER_ON;
 		backlight_update_status(pmac_backlight);
 	}
 	mutex_unlock(&pmac_backlight_mutex);