conf:seco-genio700: Remove genio-700-evk from overrides

This does not seem to break any functionality, but removes all evk-dependent dtbo files, those aren't relevant for us. Video and apusys overlays are built with mt8390 override.

devicetree/
├── apusys.dtbo
├── baseboard-csm-b79.dtbo
├── gpu-mali.dtbo
├── peripheral-can.dtbo
└── video.dtbo