Update __torch_dispatch__ to return op overload instead of the opoverload packet function (#72673)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/72673
Test Plan: Imported from OSS
Reviewed By: mruberry
Differential Revision: D34627164
Pulled By: anjali411
fbshipit-source-id: 3cb6406a392d530bf9da36b4d8e0a62b30e6497e
(cherry picked from commit 65b85a0a67df4d0f16ac8964e2b685d478a610fb)
