riscv: GCM: Provide a Zvbb/Zvbc-based implementation
The RISC-V vector crypto extensions features a Zvbc extension
that provides a carryless multiplication ('vclmul.vv') instruction.
This patch provides an implementation that utilizes this
extension if available.
Tested on QEMU and no regressions observed.
Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21923)