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/nand/denali.c b/drivers/mtd/nand/denali.c
index 8c5dc89..d527621 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1644,7 +1644,7 @@
 		goto failed_req_irq;
 	}
 
-	ret = add_mtd_device(&denali->mtd);
+	ret = mtd_device_register(&denali->mtd, NULL, 0);
 	if (ret) {
 		dev_err(&dev->dev, "Spectra: Failed to register MTD: %d\n",
 				ret);
@@ -1676,7 +1676,7 @@
 	struct denali_nand_info *denali = pci_get_drvdata(dev);
 
 	nand_release(&denali->mtd);
-	del_mtd_device(&denali->mtd);
+	mtd_device_unregister(&denali->mtd);
 
 	denali_irq_cleanup(dev->irq, denali);