Summary:
Pull Request resolved: https://github.com/facebookresearch/faiss/pull/3716
Renaming `USE_ROCM` to `FAISS_ENABLE_ROCM` in CMake files, `FAISS_ENABLE_ROCM` in SWIG files, and `USE_AMD_ROCM` in other source files to follow the existing naming convention.
Reviewed By: mnorris11
Differential Revision: D60673731
fbshipit-source-id: 1aaa3f2ff6836830c4eb733ee7f41554f79f9695