Add support for Zilsd and Zcmlsd extension

[lavanyajagan]

Description

Adding Support for Zilsd and Zcmlsd Extensions presented here:

Related Issues

The related PRs

• riscv-config support for the extension merged in dev PR
• riscv-isa-sim support for the extension available in master : commit id
• SAIL PR
• riscv-ctg PR
• riscv-isac PR
• Sample test env

Update to/for Ratified/Unratified Extensions or to framework

• Ratified
• Unratified
• Framework

List Extensions

The unratified spec document:
https://github.com/riscv/riscv-zilsd/blob/main/zilsd.adoc

Reference Model Used

• SAIL
• Spike
• Other - < SPECIFY HERE >

Mandatory Checklist:

• Make sure to have created a suitable entry in the CHANGELOG.md under [WIP-DEV] section.

[UmerShahidengr]

@lavanyajagan have you generated the ACTs based on these macros? If yes, then can you please provide those ACTs for review. Since this is unratified, and alot of work is pending for approval, it will be difficult to recreate the whole environment at my side and review this work.
ACTs will be easier to review.

[lavanyajagan]

ARCH test PR:

I will check with James to remove the "Draft". Could we provide a docker environment of the whole setup for you to re-run at your end?

[UmerShahidengr]

@lavanyajagan I have found the tests in riscv-arch-tests (PR#467), for some reason, you have declared the tests in a draft PR. When will you release it for official review? It seems like the draft email will keep your other ones in the queue.

[lavanyajagan]

The arch-test PR is updated. Also merge conflicts are resolved in this PR. Kindly review