[vllm] fix: restore vllm patch

[tardis-key]

What does this PR do?

enable vllm patch

fix ci error introduced by #7061

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[gemini-code-assist]

Code Review

This pull request introduces an import of npu_vllm_patch in verl/utils/vllm/__init__.py. However, the relative import syntax used (import .npu_vllm_patch) is invalid in Python and will cause a SyntaxError. It should be corrected to from . import npu_vllm_patch.

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[tardis-key]

@Secbone please review

[Secbone]

LGTM 👍