Support clustered-cores

[jerryz123]

Bumps rocket-chip to grab the currently WIP clustered-core API. This lets us build hierarchical subsystems, with core-clusters, local-core-complexes, and (ideally) cluster-local hierarchical private caches.

Requires merge of chipsalliance/rocket-chip#3490

Related PRs / Issues:

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• RTL change
• Software change (RISC-V software)
• Build system change
• Other

Contributor Checklist:

• Did you set main as the base branch?
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• (If applicable) Did you update the conda .conda-lock.yml file if you updated the conda requirements file?
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