Remove hammer-mentor-plugins submodule from default chipyard

[elamdf]

hammer-mentor-plugins is a private (NDAed) repository and shouldn't be a prt of the default chipyard repo, since it will break scripts that fetch all submodules due to insufficient permissions.

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?
• Is this PR's title suitable for inclusion in the changelog and have you added a changelog:<topic> label?
• Did you state the type-of-change/impact?
• Did you delete any extraneous prints/debugging code?
• Did you mark the PR with a changelog: label?
• (If applicable) Did you update the conda .conda-lock.yml file if you updated the conda requirements file?
• (If applicable) Did you add documentation for the feature?
• (If applicable) Did you add a test demonstrating the PR?

• (If applicable) Did you mark the PR as Please Backport?

CI Help:
Add the following labels to modify the CI for a set of features.
Generally, a label added only affect subsequent changes to the PR (i.e. new commits, force pushing, closing/reopening).
See ci:* for full list of labels:

• ci:fpga-deploy - Run FPGA-based E2E testing
• ci:local-fpga-buildbitstream-deploy - Build local FPGA bitstreams for platforms that are released
• ci:disable - Disable CI

[abejgonzalez]

@Mergifyio copy main

[mergify]

copy main

✅ Pull request copies have been created

Details

• Copy to branch main not needed, change already in branch main

[abejgonzalez]

SFTM. Pending CI.