[XLA:Python] Delete unused method make_cross_host_receive_buffers.
[XLA:Python] Delete unused method make_cross_host_receive_buffers.

This was added as part of a prototype but no users appear to exist any more, and it was never a publicized API.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/11331 from ROCm:rocm_triton_fix_1 a4f80a3f32a10230bfdaa1dadc12f1f385883d8a
