cryptosoft, ccr: Use crp_iv directly for AES-CCM and AES-GCM.

Rather than copying crp_iv to a local array on the stack that is then
passed to xform reinit routines, pass crp_iv directly and remove the
local copy.

Reviewed by: markj
Sponsored by: Chelsio Communications, The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D32106