lib/crypto: s390/sha3: Add optimized Keccak functions

lib/crypto: s390/sha3: Add optimized Keccak functions

Implement sha3_absorb_blocks() and sha3_keccakf() using the hardware-
accelerated SHA-3 support in Message-Security-Assist Extension 6.

This accelerates the SHA3-224, SHA3-256, SHA3-384, SHA3-512, and
SHAKE256 library functions.

Note that arch/s390/crypto/ already has SHA-3 code that uses this
extension, but it is exposed only via crypto_shash.  This commit brings
the same acceleration to the SHA-3 library.  The arch/s390/crypto/
version will become redundant and be removed in later changes.

Tested-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20251026055032.1413733-11-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>