mtd-utils: upgrade 2.1.3 -> 2.1.4

https://lore.kernel.org/all/c31dba4f-42a8-ba48-7df2-b56bf4699a4c@sigma-star.at/t/



Roughly half a year after the last release, this is a smaller, patch level
release that primarily consists of a hand full of fixes that have accumulated
since then.

This includes some fixes regarding the user space ports of mtd-tests using the
wrong page size, and most recently a fix regarding a missing jffs2 kernel header
in the last release tarball, causing build failures on some systems.

Changes from 2.1.3 to 2.1.4:

Features:
      - ubiscan debugging and statistics utility

Fixes:
      - Some mtd-tests erroneously using sub-pages instead of the full page size
      - Buffer overrun in fectest
      - Missing jffs2 kernel header in the last release, leading to build
        failures on some systems.

Signed-off-by: Denys Dmytriyenko <denis@denix.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>