Styx, revision B

[wkz]

Description

Add board support for the second revision (B) of the styx board.

We now ship two DTB:s ( styx-a.dtb and styx-b.dtb). Due to the fact that I did not version the names from the start, we also ship a symlink from styx.dtb which points to revision A. This should hopefully take care of any backwards compat issues.

Checklist

Tick relevant boxes, this PR is-a or has-a:

• [ ] Bugfix
  • [ ] Regression tests
  • [ ] ChangeLog updates (for next release)
• [ ] Feature
  • [ ] YANG model change => revision updated?
  • [ ] Regression tests added?
  • [ ] ChangeLog updates (for next release)
  • [ ] Documentation added?
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (please detail in commit messages)
• [ ] Build related changes
• [ ] Documentation content changes
• [x] Other (please describe): Board support