mtd, ubi, ubifs: resync with Linux-3.14

resync ubi subsystem with linux:

commit 455c6fdbd219161bd09b1165f11699d6d73de11c
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sun Mar 30 20:40:15 2014 -0700

    Linux 3.14

A nice side effect of this, is we introduce UBI Fastmap support
to U-Boot.

Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Sergey Lapin <slapin@ossfans.org>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Joerg Krause <jkrause@posteo.de>
diff --git a/board/prodrive/alpr/nand.c b/board/prodrive/alpr/nand.c
index 50e8d82..5427de5 100644
--- a/board/prodrive/alpr/nand.c
+++ b/board/prodrive/alpr/nand.c
@@ -93,6 +93,7 @@
 	}
 }
 
+#if defined(CONFIG_MTD_NAND_VERIFY_WRITE)
 static int alpr_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
 {
 	int i;
@@ -103,6 +104,7 @@
 
 	return 0;
 }
+#endif
 
 static int alpr_nand_dev_ready(struct mtd_info *mtd)
 {
@@ -128,7 +130,9 @@
 	nand->read_byte  = alpr_nand_read_byte;
 	nand->write_buf  = alpr_nand_write_buf;
 	nand->read_buf   = alpr_nand_read_buf;
+#if defined(CONFIG_MTD_NAND_VERIFY_WRITE)
 	nand->verify_buf = alpr_nand_verify_buf;
+#endif
 	nand->dev_ready  = alpr_nand_dev_ready;
 
 	return 0;