[Fix] Support multi-node distributed training with NPU backend

[shun001]

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Motivation

Fix the problem that multi-node distributed training would fail at initial when training with NPU.

Modification

In mmengine/dist/util.py, we change rank to local rank when initializing process group with NPU.

BC-breaking (Optional)

None

Use cases (Optional)

None

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDetection or MMPretrain.
4. The documentation has been modified accordingly, like docstring or example tutorials.