Add matrix AB ReadNoSnp path

[zykucas]

Summary

This PR adds support for routing Matrix A/B Get requests through the CHI ReadNoSnp path when enabled by configuration.

The feature is controlled by a new EnableMatrixABNoSnpGet parameter. When enabled, Matrix A/B reads are marked in the L2 request path and later converted to ReadNoSnp on the TL-CHI side.

Changes

• Added EnableMatrixABNoSnpGet as a configurable L2 parameter.
• Added Matrix A/B identification helpers.
• Added a matrixAB bit to TaskBundle and MetaEntry.
• Marked Matrix A/B Get requests in SinkA.
• Converted eligible Matrix A/B Get requests to CHI ReadNoSnp in tl2chi/MSHR.
• Disabled unnecessary CompAck/snoop attributes for Matrix A/B ReadNoSnp.
• Preserved matrixAB metadata through MainPipe metadata updates.
• Added silent replacement handling for clean Matrix A/B ReadNoSnp cachelines.
• Fixed the TL-to-TL MainPipe path to initialize and preserve the new matrixAB field.

Validation

• coupledL2-test-matrix-trace: passed
  • Trace summary: sent{R/W/E}=160/32/0, recv{R/W/E}=160/32/0
  • Finalized at cycle 2222

This PR is expected to be used together with the corresponding OpenLLC PR that adds LLC-side ReadNoSnp handling.

[Ivyfeather]

This work has been migrated to OpenXiangShan/XSAICache#5. Closing this PR in favor of the consolidated implementation there.