lib/device_map.py: add rk3399_gru_kevin as a Depthcharge device
lib/device_map.py: add rk3399_gru_kevin as a Depthcharge device

Add a new entry in the device map for the rk3399-gru-kevin Chromebook
device which uses the Coreboot/Depthcharge bootloader.

Signed-off-by: Guillaume Tucker <e7e20b7c30f19d4ca6b81319ef81bf200369d137@collabora.com>

kernelci/lava-ci-staging,kernelci/lava-ci-staging,kernelci/lava-ci-staging