UBIFS: kill BKL
The BKL was pushed down from VFS to the file-systems. It used
to serialize mount/unmount/remount and prevented more than one
instance of the same file-system from doing
mount/umount/remount at the same time. But it is OK for UBIFS
and it does not need any additional locking for these cases.
Thus, kick the BKL out of UBIFS.
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
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