drivers/mtd/nand: Move conditional compilation to Makefile

rename CFG_NAND_LEGACY to CONFIG_NAND_LEGACY

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/VCMA9.h b/include/configs/VCMA9.h
index ad8db61..02cabb2 100644
--- a/include/configs/VCMA9.h
+++ b/include/configs/VCMA9.h
@@ -254,7 +254,7 @@
  */
 #if defined(CONFIG_CMD_NAND)
 
-#define CFG_NAND_LEGACY
+#define CONFIG_NAND_LEGACY
 #define CFG_MAX_NAND_DEVICE	1	/* Max number of NAND devices		*/
 #define SECTORSIZE 512