Update XLA registrations to pybind11 style. (#1920)
* Update XLA registrations to pybind11 style.
Companion to https://github.com/pytorch/pytorch/pull/36258
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
* Remove namespace too
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
* Delete .torch_pin
