target/riscv: move ratified/frozen exts to non-experimental

target/riscv: move ratified/frozen exts to non-experimental

smaia and ssaia were ratified in August 25th 2023 [1].

zvfh and zvfhmin were ratified in August 2nd 2023 [2].

zfbfmin and zvfbf(min|wma) are frozen and moved to public review since
Dec 16th 2023 [3].

zaamo and zalrsc are both marked as "Frozen" since January 24th 2024
[4].

[1] https://jira.riscv.org/browse/RVS-438
[2] https://jira.riscv.org/browse/RVS-871
[3] https://jira.riscv.org/browse/RVS-704
[4] https://jira.riscv.org/browse/RVS-1995

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20240301144053.265964-1-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>