Revert "[openmp] Add OMPT initialization in libomptarget"

Reverting initial OMPT for target implementation in favor of a
different implementation.

This reverts commit 3bc8ce5dd718beef0031bf4b070ac4026e6910d7.

GitOrigin-RevId: 52da6f562e7d45f03ca4c5e291987f4ebdacccf1
11 files changed