crypto: arm64/sha256 - clean up backwards function names

In the Linux kernel, a function whose name has two leading underscores
is conventionally called by the same-named function without leading
underscores -- not the other way around.  __sha256_block_data_order()
and __sha256_block_neon() got this backwards.  Fix this, albeit without
changing the names in the perlasm since that is OpenSSL code.  No change
in behavior.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>