mtd-utils: Remove duplicate assignments to alternative link names

The two duplicate lines are not needed. The existence is confusing.

Signed-off-by: Thomas Viehweger <patchesThomas.Vie@web.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 36bdb4fa)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>