mtd: nand: new base driver for memory mapped nand devices

The BF537-STAMP Blackfin board had a driver for working with NAND devices
that are simply memory mapped.  Since there is nothing Blackfin specific
about this, generalize the driver a bit so that everyone can leverage it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Scott Wood <scottwood@freescale.com>
diff --git a/include/configs/bfin_adi_common.h b/include/configs/bfin_adi_common.h
index 4149a29..1ca2e51 100644
--- a/include/configs/bfin_adi_common.h
+++ b/include/configs/bfin_adi_common.h
@@ -38,6 +38,9 @@
 #  define CONFIG_CMD_USB_STORAGE
 #  define CONFIG_DOS_PARTITION
 # endif
+# ifdef CONFIG_NAND_PLAT
+#  define CONFIG_CMD_NAND
+# endif
 # ifdef CONFIG_POST
 #  define CONFIG_CMD_DIAG
 # endif