crypto: riscv - add vector crypto accelerated SHA-{256,224}

Add an implementation of SHA-256 and SHA-224 using the Zvknha or 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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