fix(export): update API for disabling device reassignment in TRTLLM for Aligner

[terrykong]

• Also clean up some unused imports

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[github-actions]

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

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Your code was analyzed with PyLint. The following annotations have been identified:

************* Module nemo.export.trt_llm.tensorrt_llm_run
nemo/export/trt_llm/tensorrt_llm_run.py:506:0: C0301: Line too long (125/119) (line-too-long)
nemo/export/trt_llm/tensorrt_llm_run.py:510:0: C0301: Line too long (136/119) (line-too-long)
nemo/export/trt_llm/tensorrt_llm_run.py:514:0: C0301: Line too long (123/119) (line-too-long)
nemo/export/trt_llm/tensorrt_llm_run.py:557:0: C0301: Line too long (181/119) (line-too-long)
nemo/export/trt_llm/tensorrt_llm_run.py:839:0: C0301: Line too long (153/119) (line-too-long)
nemo/export/trt_llm/tensorrt_llm_run.py:524:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/tensorrt_llm_run.py:533:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/tensorrt_llm_run.py:591:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/tensorrt_llm_run.py:33:0: W0611: Unused Mapping imported from tensorrt_llm.mapping (unused-import)

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Your code has been rated at 9.75/10

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Thank you for improving NeMo's documentation!

[github-actions]

[🤖]: Hi @terrykong 👋,

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

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g