board/MynaPlayer odyssey: remove rauc partition from genimage, and reworked the overlay filesystem creation. ...

The rauc partition was not needed seeing we make use of a large overlay filesystem. Remove it.

The fstab is now an empty file, so we avoid the original buildroot one.

The rauc-marking-good.service now runs mkdir -p to create the /rauc directory before it marks the slot good.

Also, the post-image script was modified to no longer create filesystems using fallocate. This was honestly dirty and added one more dependency in building MynaPlayer.

Genimage now takes care of creating the overlay filesystem instead.

board/MynaPlayer odyssey: fix rauc-mark-good.service. ...

Readded the [Install] section, and added 'ConditionKernelCommandLine=|bootchooser.active' to make this service trigger only if barebox's bootchooser framework passed the correct argument into the kernel command line.

board/MynaPlayer odyssey: hopefully fix networking. ...

Long story short, makedev syntax does not seem to cope well with spaces at all, so our only way is to change the profile name and the file name of the nmconnection file.

board/MynaPlayer odyssey: make rauc a bit more functionnal. ...

This replaces the previous service that marked the system as good when booting up with one that has the following:

- Starts after sshd, login prompt on serial console, and NetworkManager have all started up.
- Requires those three services to be up, not simply wanting them.
- If any of them fail to start, the rauc-mark-good.service fails with the result dependency and the rauc-failure.service included by this commit is triggered, and immediately reboots the system.
- The [Install] section is no longer required due to the service being pulled along by its own dependencies.

board/MynaPlayer odyssey: added basic service to mark boot as good with rauc.

board/MynaPlayer odyssey: fix IPv6 for the wired connection. ...

The default setting for generating addresses in IPv6 with NetworkManager is stable-privacy. That makes for unpredictable IPv6 addresses accross slots, and is hence entirely inacceptable. This commit changes this to be standard SLAAC without privacy instead. This also adds a device table to set the correct file permissions for the provided nmconnection file (0600 is required).

board/MynaPlayer odyssey: Allow root to login via ssh (prohibit-password). Disabled clear text password authentification.

Initial commit.