UBI: Fastmap: Make self_check_eba() depend on fastmap self checking

...instead of generic self checking.

Signed-off-by: Richard Weinberger <richard@nod.at>
Git-commit: 560d86a1a210000b33859cd66e051fcb516a3559
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Nikhilesh Reddy <reddyn@codeaurora.org>