device/*: add Maintainer line for devices that I practically maintain (MR 6170)

Since we have aports-qa-bot now set up to ping maintainers, let's make
it explicit that I maintain these packages.

Clean up CODEOWNERS as well for my entries which anyways contain my
username which is not used on gitlab.p.o.

[ci:skip-vercheck] # even though Maintainer line is embedded in .apk, it
doesn't make sense to mass rebuild these packages just for that.
[ci:ignore-count]
[ci:skip-build]: already built successfully in CI