UBI: load after mtd device drivers

Use 'late_initcall()' in UBI to make sure it initializes after MTD drivers.

Signed-off-by: Jiang Lu <[e-mail]>
Signed-off-by: Artem Bityutskiy <[e-mail]>

drivers/mtd/ubi/build.c

···
 	ubi_err("UBI error: cannot initialize UBI, error %d", err);
 	return err;
 }
-module_init(ubi_init);
+late_initcall(ubi_init);
 
 static void __exit ubi_exit(void)
 {