[OpenMP][NFC] clang-format the OpenMP device runtime

These files aren't fully formatted. I'm guessing this was a holdover
from when `clang-format` was totally broken for OpenMP offloading.
Format the files to be more consistent.

Reviewed By: tianshilei1992

Differential Revision: https://reviews.llvm.org/D151226

GitOrigin-RevId: 47800a12dcb4cb6fee395f86cb7a81aa3fb4b932
8 files changed