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/common/cmd_ubifs.c b/common/cmd_ubifs.c
index 19c8a43..8e9a4e5 100644
--- a/common/cmd_ubifs.c
+++ b/common/cmd_ubifs.c
@@ -38,7 +38,7 @@
 		ubifs_initialized = 1;
 	}
 
-	ret = ubifs_mount(vol_name);
+	ret = uboot_ubifs_mount(vol_name);
 	if (ret)
 		return -1;