crypto: sm3 - Replace with wrapper around library

crypto: sm3 - Replace with wrapper around library

Reimplement the "sm3" crypto_shash on top of the SM3 library, closely
mirroring the other hash algorithms (e.g. SHA-*).

The result, after later commits migrate the architecture-optimized SM3
code into the library as well, is that crypto/sm3.c will be the single
point of integration between crypto_shash and the actual SM3
implementations, simplifying the code.

Note: to see the diff from crypto/sm3_generic.c to crypto/sm3.c, view
this commit with 'git show -M10'.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260321040935.410034-7-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>