WIP: Flounder testing branch

This adds a couple goodies to the normal flounder package to mount /vendor in initfs and the OS itself, modifies the firmware package to add under /lib/firmware AND /lib/firmware/postmarketos just to be sure while we nail down the reboots after ten minutes. This removes a lot of warnings about touchscreen and other firmware not being found.

See here in the new dmesg: https://gist.github.com/Alexandroid99/4eb8ab4a6ed72b351bad872cb8bd3cab

Ontop of that we're adding an experimental set of packages for flounder where the more brutal hacks can take place. The pull request doesn't allow me to request opening a new branch but I'd highly recommend to edit it and push to a new one instead of master, the experimental packages at the very least.