Merge the remaining RVA32 extensions and several other important extensions from the main branch.

Mainly includes the following RISC-V extensions modifications.

1. Removed privileged spec 1.9.1 support.
2. Add support for Zfbfmin extension.
3. Add support for Zvfbfmin extension.
4. Add support for Zvfbfwma extension.
5. Support Zabha extension.
6. Support Zabha extension.
7. Add platform property/capability extensions.
8. Support ssctr/smctr extensions with frozen version 1.0.
9. Support S[sm]csrind extension csrs.
10. Support Smcdeleg and Ssccfg extensions.
11. Add Smrnmi extension csrs.
12. Support B, Zaamo and Zalrsc extensions.
13. Support Zacas extension.
14. Add support for Zimop extension
15. Support CFI Zicfiss and Zicfilp instructions and CSR.
16. Add Zabha extension CAS instructions.