[OpenMP][NFC] Clang format libomptarget code (src & include)

The struct and enum alignments are kept by disabling clang-format for
that code region.

Reviewed By: tianshilei1992, JonChesterfield, grokos

Differential Revision: https://reviews.llvm.org/D96428

GitOrigin-RevId: 9cd1e2228c70c9ff30bcefd5b287db8dac9c6019
8 files changed