crypto: arm64/sha1-ce - 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.  __sha1_ce_transform() got this
backwards.  Fix this.  No change in behavior.

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