tcp: do not export tcp_parse_mss_option() and tcp_mtup_init()

These two functions are not called from modules.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250206093436.2609008-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>