selftests/net: packetdrill: add tcp_ooo_rcv_mss.pkt

We make sure tcpi_rcv_mss and tp->scaling_ratio
are correctly updated if no in-order packet has been received yet.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250711114006.480026-6-edumazet@google.com


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