crypto: Use scatterwalk_crypto_chain

Use scatterwalk_crypto_chain in favor of locally defined chaining functions.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --cc crypto/authenc.c
Simple merge

diff --cc crypto/eseqiv.c
Simple merge

diff --cc crypto/gcm.c
Simple merge