Revert "Dynamo Export use fake tensor (#94276)"
This reverts commit 54fa9801868ae71565b3b237bc2bbcce90e42017.
Reverted https://github.com/pytorch/pytorch/pull/94276 on behalf of https://github.com/jeanschmidt due to break several internal build/test jobs: https://fburl.com/phabricator/1tik7ggb
