Add Librem5 devkit
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This adds initial support for the librem5 devkit. There are commits here to also fix issues with main/postmarketos-mkinitfs and main/devicepkg-dev, which the librem5 devkit packages depend on. @ollieparanoid I can split these out into separate merge requests, but it just makes managing the other commits more difficult so I decided to submit the whole series together.
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