[DCU]support dcu PagedAttention prefix in compute_mla_absorb

[zhanghonggeng]

Before submitting

• Lint code. If there are lint issues, please format the code first.

# Install and register `pre-commit` in the project folder
pip install pre-commit && pre-commit install

# Process previous code files separately
pre-commit run --file XXXX.py

• Add test cases into tests folder. If there are codecov issues, please add tests cases first.

PR types

PR changes

Description

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.

Project coverage is 49.69%. Comparing base (42ba2c0) to head (a653d0b).
Report is 53 commits behind head on develop.

❗ Current head a653d0b differs from pull request most recent head 4eaa8b2

Please upload reports for the commit 4eaa8b2 to get more accurate results.

Files with missing lines	Patch %	Lines
...erimental/transformers/fused_transformer_layers.py	0.00%	24 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (49.69%) is below the target coverage (58.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10229      +/-   ##
===========================================
- Coverage    49.95%   49.69%   -0.27%     
===========================================
  Files          757      761       +4     
  Lines       122540   124243    +1703     
===========================================
+ Hits         61217    61742     +525     
- Misses       61323    62501    +1178     

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