crypto: aead - Add type-safe geniv init/exit helpers

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: Herbert Xu <herbert@gondor.apana.org.au>

diff --cc crypto/Kconfig
Simple merge

diff --cc crypto/aead.c
Simple merge

diff --cc include/crypto/internal/aead.h
Simple merge

diff --cc include/crypto/internal/geniv.h
Simple merge