crypto: sm3 - Remove the original "sm3_block_generic()"

crypto: sm3 - Remove the original "sm3_block_generic()"

Since the architecture-optimized SM3 code was migrated into lib/crypto/,
sm3_block_generic() is no longer called.  Remove it.  Then, since this
frees up the name, rename sm3_transform() to sm3_block_generic()
(matching the naming convention used in other hash algorithms).

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260321040935.410034-12-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>