Fix JFFS2 support for legacy NAND driver.

Some more NAND cleanup and small fixes.
diff --git a/include/configs/omap2420h4.h b/include/configs/omap2420h4.h
index 12252ac..5837461 100644
--- a/include/configs/omap2420h4.h
+++ b/include/configs/omap2420h4.h
@@ -132,6 +132,7 @@
 /*
  *  Board NAND Info.
  */
+#define CFG_NAND_LEGACY
 #define CFG_NAND_ADDR 0x04000000  /* physical address to access nand at CS0*/
 
 #define CFG_MAX_NAND_DEVICE 1	/* Max number of NAND devices */