libsysdecode: fix decoding of TCP_NOPUSH and TCP_MD5SIG

TCP_FASTOPEN_MIN_COOKIE_LEN was incorrectly registered as a name of
a IPPROTO_TCP level socket option, which overwrote TCP_NOPUSH.
TCP_FASTOPEN_PSK_LEN was incorrectly registered as a name of an
IPPROTO_TCP level socket option, which overwrote TCP_MD5SIG.

Approved by: re (gjb)
Sponsored by: Netflix, Inc.

(cherry picked from commit f25266bee7dafb10f03e06537c8127cc17335bed)
(cherry picked from commit 2a9b68d5e1bba633c37cc829f52e79e1281e910b)