CODEOWNERS: fine tune @MrKevinWeiss code ownership
CODEOWNERS: fine tune @MrKevinWeiss code ownership

Remove from all tests
Add openmote board ownership
Add to periphs for cpu, drivers, and tests

OTAkeys/RIOT,basilfx/RIOT,basilfx/RIOT,miri64/RIOT,yogo1212/RIOT,OlegHahm/RIOT,authmillenon/RIOT,smlng/RIOT,OlegHahm/RIOT,kYc0o/RIOT,jasonatran/RIOT,yogo1212/RIOT,kYc0o/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,ant9000/RIOT,ant9000/RIOT,jasonatran/RIOT,jasonatran/RIOT,authmillenon/RIOT,miri64/RIOT,smlng/RIOT,OlegHahm/RIOT,authmillenon/RIOT,ant9000/RIOT,basilfx/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,authmillenon/RIOT,OTAkeys/RIOT,kaspar030/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,ant9000/RIOT,smlng/RIOT,OTAkeys/RIOT,yogo1212/RIOT,basilfx/RIOT,yogo1212/RIOT,smlng/RIOT,kYc0o/RIOT,jasonatran/RIOT,kYc0o/RIOT,miri64/RIOT,ant9000/RIOT,miri64/RIOT,kaspar030/RIOT,authmillenon/RIOT,yogo1212/RIOT,kaspar030/RIOT,miri64/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,jasonatran/RIOT,smlng/RIOT,OTAkeys/RIOT,authmillenon/RIOT,basilfx/RIOT,kYc0o/RIOT,OTAkeys/RIOT