Add new machine: Strato Pi Base

[lopes-victor]

Support for Strato Pi boards

https://sferalabs.cc/strato-pi/
https://github.com/sfera-labs/strato-pi-kernel-module

[floion]

Hi, thanks for the suggestion.
At the moment we do not see a demand for this hw but you can do the integration work if you need it supported and contribute it to balena: https://github.com/balena-os/meta-balena/blob/master/contributing-device-support.md