Sync TCP related kernel config options

Add TCP_BLACKBOX to the remaining platforms (arm64, RISC-V) and add
TCP_RFC7413 to the remaining platform (RISC-V).

Reviewed by: rscheff@
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D36918

(cherry picked from commit ad20efdde208485db97027a00c4b08a7daa9c663)