/usr/powerpc64le-linux-gnu/lib/libitm.so.1 is in libitm1-ppc64el-cross 8-20180414-1ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/powerpc64le-linux-gnu/lib/libitm.so.1.0.0
/usr/powerpc64le-linux-gnu/lib/libitm.so.1.0.0