The KUnit maintainers would like to maintain these files on their
side too (thanks!), so add them to their entry.
With this in place, `scripts/get_maintainer.pl` prints both sets
of maintainers/reviewers (i.e. KUnit and Rust) for those files,
which is the behavior we are looking for.
Signed-off-by: Miguel Ojeda <ojeda@xxxxxxxxxx>
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