Include additional S_extensions: s*clint, s*clic, s*csrind

[dansmathers]

Adding additional S_extensions: 'Smcsrind','Sscsrind','Smclint','Ssclint','Smclic','Ssclic','Smclicshv'

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Update to/for Ratified/Unratified Extensions

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• Unratified

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Mandatory Checklist:

• Make sure you have updated the versions in setup.cfg and riscv_config/__init__.py. Refer to CONTRIBUTING.rst file for further information.
• Make sure to have created a suitable entry in the CHANGELOG.md.