To match up with the sample conf file under bin/konsulko-labgrid, add a boardenv file for the rpi_4 and rpi_arm64 variants (cannot be shared with rpi_4_32b as we have aarch64 specific example test files). This shows how to enable network based tests, including OS boot on the platform. Signed-off-by: Tom Rini <trini@konsulko.com>