crypto: hash - Remove unused async iterators

Revert "crypto: hash - Add real ahash walk interface"
This reverts commit 75ecb231.

The callers of the functions in this commit were removed in ab8085c1

Remove these unused calls.

Fixes: ab8085c1 ("crypto: x86 - remove SHA multibuffer routines and mcryptd")
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>