Enable test_DistributedDataParallel_SyncBatchNorm_2D_Input unit test (#33573)
Summary:
Test needs ability to toggle cuDNN/MIOpen at runtime (enabled in PR https://github.com/pytorch/pytorch/issues/33118)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33573
Differential Revision: D21360260
Pulled By: mrshenli
fbshipit-source-id: 6e26edc0932efb5d278c2ffc919979b8eb089216
