Remove feature-removal-schedule.txt

Remove feature-removal-schedule.txt

This patch removes the old feature-removal-schedule.txt file from
mtd-utils, mostly for reasons similar to the ones that lead to the
decision of removing the feature-removal-schedule.txt from the kernel.

Removing features by itself is rather problematic as there is no
simple way of estimating whether something is being used widley or
not at all. Thus, consensus usually tends towards not removing
features at all.

Even if there is a file anouncing feature removal, users in large
won't read this file _if_ it is even included in distribution
packages. People working on mtd-uils would end up removing features
that _they_ find useless and users would start complaining once
their setups break after they install a new version of mtd-utils.

In conclusion, once introduced, features should not be removed to
begin with and this file is entirely usless.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>