tests/kconfig_features: Add saml21-based boards to whitelist
tests/kconfig_features: Add saml21-based boards to whitelist

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