nand_util: convert nand_write_skip_bad() to flags

In a future commit the behaviour of nand_write_skip_bad()
will be further extended.

Convert the only flag currently passed to the nand_write_
skip_bad() function to a bitfield of only one allocated
member. This should avoid an explosion of int's at the
end of the parameter list or the ambiguous calls like

nand_write_skip_bad(info, offset, len, buf, 0, 1, 1);
nand_write_skip_bad(info, offset, len, buf, 0, 1, 0);

Instead there will be:

nand_write_skip_bad(info, offset, len, buf, WITH_YAFFS_OOB |
			WITH_OTHER);

Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
Acked-by: Detlev Zundel <dzu@denx.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>
diff --git a/include/nand.h b/include/nand.h
index 7459bd0..b0a31b8 100644
--- a/include/nand.h
+++ b/include/nand.h
@@ -114,8 +114,11 @@
 
 int nand_read_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
 		       u_char *buffer);
+
+#define WITH_YAFFS_OOB	(1 << 0) /* whether write with yaffs format */
+
 int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
-			u_char *buffer, int withoob);
+			u_char *buffer, int flags);
 int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts);
 
 #define NAND_LOCK_STATUS_TIGHT	0x01