crypto: riscv - add vector crypto accelerated SHA-{512,384}

Add an implementation of SHA-512 and SHA-384 using the Zvknhb extension.
The assembly code is derived from OpenSSL code (openssl/openssl#21923)
that was dual-licensed so that it could be reused in the kernel.
Nevertheless, the assembly has been significantly reworked for
integration with the kernel, for example by using a regular .S file
instead of the so-called perlasm, using the assembler instead of bare
'.inst', and greatly reducing code duplication.

Co-developed-by: Charalampos Mitrodimas <[email protected]>
Signed-off-by: Charalampos Mitrodimas <[email protected]>
Co-developed-by: Heiko Stuebner <[email protected]>
Signed-off-by: Heiko Stuebner <[email protected]>
Co-developed-by: Phoebe Chen <[email protected]>
Signed-off-by: Phoebe Chen <[email protected]>
Signed-off-by: Jerry Shih <[email protected]>
Co-developed-by: Eric Biggers <[email protected]>
Signed-off-by: Eric Biggers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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