mtd: onenand: convert to mtd_device_register()

Convert to mtd_device_register() and remove the CONFIG_MTD_PARTITIONS
preprocessor conditionals as partitioning is always available.

Cc: Kyungmin Park <kyungmin.park@samsung.com>
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/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 289ee3b..ac9e959 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -4142,12 +4142,8 @@
 {
 	struct onenand_chip *this = mtd->priv;
 
-#ifdef CONFIG_MTD_PARTITIONS
 	/* Deregister partitions */
-	del_mtd_partitions (mtd);
-#endif
-	/* Deregister the device */
-	del_mtd_device (mtd);
+	mtd_device_unregister(mtd);
 
 	/* Free bad block table memory, if allocated */
 	if (this->bbm) {