tcp: adjust rcvbuf in presence of reorders

This patch takes care of the needed provisioning
when incoming packets are stored in the out of order queue.

This part was not implemented in the correct way, we need
to decouple it from tcp_rcv_space_adjust() logic.

Without it, stalls in the pipe could happen.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250513193919.1089692-4-edumazet@google.com


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