fixing fsdp autowrap functionality
### What does this PR do?
1. PyTorch has renamed default_auto_wrap_policy to size_based_auto_wrap_policy. This PR updates the same.

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_The documentation is not available anymore as the PR was closed or merged._<|||||>> Thanks for the fix. I think we should proceed differently to still support the previous nightly builds, and import the old name as the new name then.

Hello, I have updated the version requirement to the stable torch version `1.12.0` and this version has the updated name for the function. The support in `1.11.0` couldn't allow for saving model when using FSDP.