cryptodev: Permit CIOCCRYPT for AEAD ciphers.

A request without AAD for an AEAD cipher can be submitted via
CIOCCRYPT rather than CIOCCRYPTAEAD.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D32108

(cherry picked from commit 70dbebea124236184a66a30175ba307793971f00)