armv8crypto: add AES-GCM support
Add support for AES-GCM using OpenSSL's accelerated routines.
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D27454
Sponsored by: Ampere Computing
Submitted by: Klara, Inc.
Approved by: re (kib)
(cherry picked from commit ed9b7f4414663703e0e9581a730c4bdfaca5687f)