CI: deviceinfo: add more strict linting / adjust all deviceinfo files

pmbootstrap and postmarketos-mkinitfs don't support multiple lines in these files, and the complexity is not worth implementing there. Let's keep the format dead-simple and enforce it across all files.

While at it, enforce that comments stat with '# ' and make sure each line has quotations (we had some without).

Related: discussion in postmarketos-mkinitfs!21 (closed)

Close postmarketos-mkinitfs!21 (closed), close postmarketos-mkinitfs#7 (closed)