crypto: hash - Add crypto_ahash_has_setkey

commit a5596d6332787fd383b3b5427b41f94254430827 upstream.

This patch adds a way for ahash users to determine whether a key
is required by a crypto_ahash transform.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --cc crypto/ahash.c
Simple merge

diff --cc crypto/shash.c
Simple merge

diff --cc include/crypto/hash.h
Simple merge