Integrate seco-base/kirkstone-gm_c31

Commit: https://git.seco.com/edgehog/seco-base/-/commit/3259f94417d5532c27e84f57f901d23467049abc

[CONFIGS][RK][C31] Fix machine config typos

Fix machine name: until now it worked because the SBC C31 is currently the fallback option for Rockchip.