Update to Siemens kas 3.3
Siemens kas 3.3 has been released and has now been adopted by meta-arm.
- Update kas usage in CI
- Update kas to file format 14
- Replace
refspec:
withbranch:
- Disable headercheck as it is not recognizing Linaro copyright statements
- Remove Arm copyright from "Licence" section of contribution guide
This isn't urgent. We don't directly use the kas files from meta-arm so this is more for downstream developer convenience. Will defer until after Cassini 1.0
Edited by Adam Johnston