Fix JFFS2 support for legacy NAND driver.

Some more NAND cleanup and small fixes.
diff --git a/include/configs/NETTA.h b/include/configs/NETTA.h
index 1bcd88d..25b6345 100644
--- a/include/configs/NETTA.h
+++ b/include/configs/NETTA.h
@@ -609,6 +609,7 @@
 /****************************************************************/
 
 /* NAND */
+#define CFG_NAND_LEGACY
 #define CFG_NAND_BASE			NAND_BASE
 #define CONFIG_MTD_NAND_VERIFY_WRITE
 #define CONFIG_MTD_NAND_UNSAFE