/usr/lib/linux-tools/4.18.0-1004-gcp/cpupower is in linux-tools-4.18.0-1004-gcp 4.18.0-1004.5~18.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.18.0-1004-gcp/../../linux-gcp-edge-tools-4.18.0-1004/cpupower