mtd: convert remaining users to mtd_device_register()

The older add_mtd_device()/add_mtd_partitions() and their removal
counterparts will soon be gone.  Replace uses with mtd_device_register()
and mtd_device_unregister().

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/maps/autcpu12-nvram.c b/drivers/mtd/maps/autcpu12-nvram.c
index 5366418..e5bfd0e 100644
--- a/drivers/mtd/maps/autcpu12-nvram.c
+++ b/drivers/mtd/maps/autcpu12-nvram.c
@@ -88,7 +88,7 @@
 	sram_mtd->owner = THIS_MODULE;
 	sram_mtd->erasesize = 16;
 
-	if (add_mtd_device(sram_mtd)) {
+	if (mtd_device_register(sram_mtd, NULL, 0)) {
 		printk("NV-RAM device addition failed\n");
 		err = -ENOMEM;
 		goto out_probe;
@@ -111,7 +111,7 @@
 static void __exit cleanup_autcpu12_maps(void)
 {
 	if (sram_mtd) {
-		del_mtd_device(sram_mtd);
+		mtd_device_unregister(sram_mtd);
 		map_destroy(sram_mtd);
 		iounmap((void *)autcpu12_sram_map.virt);
 	}