Disable BUILD_SPLIT_CUDA for now (#51533)
Summary:
BUILD_SPLIT_CUDA needs to be exported to true in order for cpp_extensions.py to work properly--currently disabling to make tree green
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51533
Reviewed By: pbelevich
Differential Revision: D26194055
Pulled By: janeyx99
fbshipit-source-id: 08d3cc7e6ba57011dddbf27f96ef5acb648b6b9a
