Revert "[inductor] Parallelize Max Autotune step 2: Use all GPUs (#107983)"
This reverts commit 2c61313ff3b9ca585f04a4bb78263f301a8cec27.
Reverted https://github.com/pytorch/pytorch/pull/107983 on behalf of https://github.com/masnesral due to fbcode failures ([comment](https://github.com/pytorch/pytorch/pull/107983#issuecomment-1714816358))
