Revert "Init CUDA instead of faking memory stats (#121698)"
This reverts commit 2460f0b1c7bb6e088aca1f6e9bb62c834053d71b.
Reverted https://github.com/pytorch/pytorch/pull/121698 on behalf of https://github.com/huydhn due to Sorry for reverting your change but I think it breaks inductor CPU tests https://hud.pytorch.org/pytorch/pytorch/commit/5b90074540577267c29f5f784be123ee54f6491d ([comment](https://github.com/pytorch/pytorch/pull/121698#issuecomment-1995868090))
