Now that the AEAD conversion is complete we can rip out the old
AEAD interafce and associated code.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch adds the helpers aead_init_geniv and aead_exit_geniv
which are type-safe and intended the replace the existing geniv
init/exit helpers.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch adds some common IV generation code currently duplicated
by seqiv and echainiv.  For example, the setkey and setauthsize
functions are completely identical.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>