Fix UBI and UBIFS - they refuse to work without debugfs. This was

broken by the 3.5-rc1 UBI/UBIFS changes when we removed the debugging
Kconfig switches.

Also, correct locking in 'ubi_wl_flush()' - it was extended to support
flushing a specific LEB in 3.5-rc1, and the locking was sub-optimal.
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