lib/crypto: mips/sha512: Migrate optimized SHA-512 code to library

Instead of exposing the mips-optimized SHA-512 code via mips-specific
crypto_shash algorithms, instead just implement the sha512_blocks()
library function.  This is much simpler, it makes the SHA-512 (and
SHA-384) library functions be mips-optimized, and it fixes the
longstanding issue where the mips-optimized SHA-512 code was disabled by
default.  SHA-512 still remains available through crypto_shash, but
individual architectures no longer need to handle it.

Note: to see the diff from
arch/mips/cavium-octeon/crypto/octeon-sha512.c to
lib/crypto/mips/sha512.h, view this commit with 'git show -M10'.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250630160320.2888-11-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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