mtd,ubi,ubifs: sync with linux v3.15

snyc with linux v3.15:

commit 1860e379875dfe7271c649058aeddffe5afd9d0d
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sun Jun 8 11:19:54 2014 -0700

    Linux 3.15

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Tom Rini <trini@ti.com>
11 files changed