Blackfin: adi config: enable nand lock/unlock support

We use the lock/unlock options in our default nand code, so enabl
support for the options.

Reported-by: Vivi Li <vivi.li@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/configs/bfin_adi_common.h

@@ -47,6 +47,7 @@
 # endif
 # if defined(CONFIG_NAND_PLAT) || defined(CONFIG_DRIVER_NAND_BFIN)
 #  define CONFIG_CMD_NAND
+#  define CONFIG_CMD_NAND_LOCK_UNLOCK
 # endif
 # ifdef CONFIG_POST
 #  define CONFIG_CMD_DIAG