/usr/lib/linux-tools/4.15.0-1015-gcp/x86_energy_perf_policy is in linux-tools-4.15.0-1015-gcp 4.15.0-1015.15.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.15.0-1015-gcp/../../linux-gcp-tools-4.15.0-1015/x86_energy_perf_policy