*/*: Maintainer reset

Drop maintainership of all ports as his own request. We thank Vladimir
for all his efforts and hope to welcome him back in the future.

PR: 261391
Approved by: Vladimir Chukharev (maintainer)
MFH: 2022Q1

(cherry picked from commit bb932872ab3e1e4bad7b64df9a882f01399c6021)