Revert D27966444: [pytorch][PR] [CUDA graphs] Avoid sync errors when graph capturing cudnn rnn calls that use cudnn dropout
Test Plan: revert-hammer
Differential Revision:
D27966444 (https://github.com/pytorch/pytorch/commit/610c984d2e2d26ac72b404d168401acfd4431610)
Original commit changeset: fe0df843c521
fbshipit-source-id: 8223b7f8b7183f0e7c9df6a7aa8f6b164e5634db
