lib/crypto: sparc/sha1: Migrate optimized code into library

Instead of exposing the sparc-optimized SHA-1 code via sparc-specific
crypto_shash algorithms, instead just implement the sha1_blocks()
library function.  This is much simpler, it makes the SHA-1 library
functions be sparc-optimized, and it fixes the longstanding issue where
the sparc-optimized SHA-1 code was disabled by default.  SHA-1 still
remains available through crypto_shash, but individual architectures no
longer need to handle it.

Note: to see the diff from arch/sparc/crypto/sha1_glue.c to
lib/crypto/sparc/sha1.h, view this commit with 'git show -M10'.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250712232329.818226-13-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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