Revert "[cuDNN][cuDNN V8 API] Always build assuming cuDNN >= 8.0 (#91527)"
This reverts commit 4d07ad74f1c11efa55501433d6cf1f06840f5207.
Reverted https://github.com/pytorch/pytorch/pull/91527 on behalf of https://github.com/DanilBaibak due to Break internal build
