fix: Remove nemo_class arg in import_hf.py

[chtruong814]

What does this PR do ?

fix: Remove nemo_class arg in import_hf.py

We should not be using eval and an arbitrary nemo_class arg in the import_hf script. This arg is not used anywhere in the NeMo repo.

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[github-actions]

[🤖]: Hi @chtruong814 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.

//cc @chtruong814 @ko3n1g @pablo-garay @thomasdhc