Add unratified Zicfilp and Zicfiss extensions

[ved-rivos]

Description

Add configurations for unratfied Zicfilp and Zicfiss extensions

Related Issues

Please list all the issues related to this PR. Use NA if no issues exist.

Update to/for Ratified/Unratified Extensions

• Ratified
• [ X] Unratified

List Extensions

Zicfilp: https://github.com/riscv/riscv-cfi/blob/main/cfi_forward.adoc
Zicfiss: https://github.com/riscv/riscv-cfi/blob/main/cfi_backward.adoc

Mandatory Checklist:

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