Remove un-used parameter in _trilinear backward (#60673)
Summary:
This argument is only important for speed and memory usage. So it is ok to ignore it during the backward.
As discussed, we might want to change this to speed up backward in the future.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60673
Reviewed By: soulitzer
Differential Revision: D29370125
Pulled By: albanD
fbshipit-source-id: ad50b3ea530aeb194f5a51845523b517a50f2c71
