crypto: s390/sha3 - Rename conflicting functions

crypto: s390/sha3 - Rename conflicting functions

Rename the s390 sha3_*_init() functions to have an "s390_" prefix to
avoid a name conflict with the upcoming SHA-3 library functions.

Note: this code will be superseded later.  This commit simply keeps the
kernel building for the initial introduction of the library.

[EB: dropped unnecessary rename of import and export functions, and
     improved commit message]

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20251026055032.1413733-2-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>