Refine imports in timesformer __init__.py
Author: Charansripadi
Pull request: yes

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Comments:
**[For maintainers]** Suggested jobs to run (before merge)

run-slow: timesformer

**CI Dashboard:** [View test results in Grafana](https://transformers-ci.lor-e.huggingface.cool/d/pytest-observability-by-pr/pytest-observability-branch?var-pr=46777)