[DEFCONFIG] Rename defconfigs
- E58 and D18 defconfigs now have the same names as in
kirkstone
- MediaTek Eval-Kit defconfig renamed to have the similar structure as NXP Eval-Kits
Please keep in mind when porting boards from kirkstone, that defconfigs should have the same names as there, as CI is expecting some particular strings
https://git.seco.com/clea-os/infrastructure/gitlab-ci/-/blob/master/build-pipeline-yocto.yml.jinja2#L208