Update for Zvkb extension.
https://github.com/riscv/riscv-crypto/blob/c8ddeb7e64a3444dda0438316af1238aeed72041/doc/vector/riscv-crypto-vector-zvkb.adoc Create `RISCV_HAS_ZVKB()` macro. Use zvkb for SM4 instead of zvbb. Use zvkb for ghash instead of zvbb. We could just use the zvbb's subset `zvkb` for flexibility. Signed-off-by: NJerry Shih <jerry.shih@sifive.com> Signed-off-by: NPhoebe Chen <phoebe.chen@sifive.com> Reviewed-by: NTomas Mraz <tomas@openssl.org> Reviewed-by: NPaul Dale <pauli@openssl.org> Reviewed-by: NHugo Landau <hlandau@openssl.org> (Merged from https://github.com/openssl/openssl/pull/21923)
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