kernel: properly insert local mtd partition parsers

kernel: properly insert local mtd partition parsers

Between 4.19 and 5.4, the kernel moved the partition parsers into
the parsers subdirectory. This led to some necessary rebasing of
our local patches for parsers, which partially has been performed
without caring about where the code was inserted.

This commit tries to adjust our local patches so that parsers are
inserted at the "proper" positions with respect to alphabetic sorting
(if possible). Thus, the commit is cosmetic.

While this might look useless now, it will make life easier when
adding other parsers in the future or for rebasing on kernel changes.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>