Merge pull request #24 from LuminaSensum/WIP_rauc ...

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

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

This adds a service that marks the system as good when booting up 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.

board/MynaPlayer odyssey: fix networking for good. ...

Long story short, makedev is used by buildroot to fix up file or directory permissions directly in the generated image. However makedev doesn't seem to take well to file names containing spaces. This commit fixes this problem by changing the file name and also the connection name itself, from NetworkManager's viewpoint.

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.