/usr/lib/linux-tools/4.15.0-1015-oem/cpupower is in linux-tools-4.15.0-1015-oem 4.15.0-1015.18.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.15.0-1015-oem/../../linux-oem-tools-4.15.0-1015/cpupower