ide: unexport ide_devset_execute()

There are no modular ide_devset_execute() users left so unexport it.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-io.c

@@ -513,7 +513,6 @@ int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(ide_devset_execute);
 
 static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq)
 {