target/riscv: add RVA23S64 profile

target/riscv: add RVA23S64 profile

Add RVA23S64 as described in [1]. This profile inherits all mandatory
extensions of RVA23U64 and RVA22S64, making it a child of both profiles.

A new "rva23s64" profile CPU is also added. This is the generated
riscv,isa for it (taken via -M dumpdtb):

rv64imafdcbvh_zic64b_zicbom_zicbop_zicboz_ziccamoa_ziccif_zicclsm_
ziccrse_zicond_zicntr_zicsr_zifencei_zihintntl_zihintpause_zihpm_zimop_
zmmul_za64rs_zaamo_zalrsc_zawrs_zfa_zfhmin_zca_zcb_zcd_zcmop_zba_zbb_zbs_
zkt_zvbb_zve32f_zve32x_zve64f_zve64d_zve64x_zvfhmin_zvkb_zvkt_shcounterenw_
sha_shgatpa_shtvala_shvsatpa_shvstvala_shvstvecd_smnpm_smstateen_ssccptr_
sscofpmf_sscounterenw_ssnpm_ssstateen_sstc_sstvala_sstvecd_ssu64xl_
supm_svade_svinval_svnapot_svpbmt

[1] https://github.com/riscv/riscv-profiles/blob/main/src/rva23-profile.adoc

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250115184316.2344583-7-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>