[C] Allow bias support for sm80/86/89 for cuDNN 9+

[cyanguwa]

Description

This PR opens up the restriction on post_scale_bias support for sm80/86/89 when cuDNN 9.0+ is installed.

Fixes QA tests for test_cp_with_fused_attention on sm80/86/89.

Type of change

• Documentation change (change only to the documentation, either a fix or a new content)
• [x ] Bug fix (non-breaking change which fixes an issue)
• [x ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Changes

• Allows the use of F16_arbitrary_seqlen backend when post_scale_bias is run on sm80/86/89 with cuDNN 9.0+.

Checklist:

• [x ] I have read and followed the contributing guidelines
• [x ] The functionality is complete
• [x ] I have commented my code, particularly in hard-to-understand areas
• [x ] I have made corresponding changes to the documentation
• [x ] My changes generate no new warnings
• [x ] I have added tests that prove my fix is effective or that my feature works
• [x ] New and existing unit tests pass locally with my changes

[timmoon10]

/te-ci