Add support for Chacha20-Poly1305 to kernel TLS on FreeBSD.

FreeBSD's kernel TLS supports Chacha20 for both TLS 1.2 and TLS 1.3.

Obtained from: OpenSSL commit 77f3936928068bee9d7e0c6939709ac179cb1059

(cherry picked from commit 3de4f78d46c58f23017942967ec74cbc3d2e175d)
(cherry picked from commit c8cf2d16139042dd9eb3ba0324c88c4cfffe7d93)

Approved by: re (gjb)