fix(910B): fix bugs in 910B for varlen and fixlen FA

[li126com]

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Motivation

issue 307

Modification

1. rotary_embedding为确保正确性采用gpu torch的版本。
2. 修改了unpack data情况下seq_len的计算逻辑。
3. 判定并修正了910B上all_reduce的op操作，由AVG转为SUM。

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories? If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

Checklist

Before PR:

• [ ] Pre-commit or other linting tools are used to fix the potential lint issues.
• [ ] Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• [ ] The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• [ ] The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• [ ] If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• [ ] CLA has been signed and all committers have signed the CLA in this PR.

[sunpengsdu]

补充PR的description

[li126com]

add description

done