Revert D28767060: [pytorch][PR] Migrate renorm to ATen (CPU and CUDA)
Test Plan: revert-hammer
Differential Revision:
D28767060 (https://github.com/pytorch/pytorch/commit/74ec50893d5e752714dfeaca6214a9de65f6b814)
Original commit changeset: 93dcbe5483f7
fbshipit-source-id: ae85d90212df4e6bb3a5da310e97ad1c06aa9a77
