[SECO] Add Seco Boards Support

Add support for SBC-C61 and other SECO boards.
This commit solves all the conflicts from 5.4 to 5.10.

Author: Natalia Kovalenko waykovalenko@gmail.com
Author: Davide Cardillo davide.cardillo@seco.com
Author: Giuseppe Pagano giuseppe.pagano@seco.com
Author: Marco Sandrelli marco.sandrelli@seco.com
Author: Tommaso Merciai tommaso.merciai@seco.com
Author: Alberto Merciai alberto.merciai@seco.com
Author: Giulio Grechi giulio.grechi@seco.com