net: tcp2: Queue received out-of-order data

If we receive data that is out-of-order, queue sequential
TCP segments until we have received earlier segment or a timeout
happens.

Note that we only queue data sequentially in current version i.e.,
there should be no holes in the queue. For example, if we receive
SEQs 5,4,3,6 and are waiting SEQ 2, the data in segments 3,4,5,6 is
queued (in this order), and then given to application when we receive
SEQ 2. But if we receive SEQs 5,4,3,7 then the SEQ 7 is discarded
because the list would not be sequential as number 6 is be missing.

Fixes #30364

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>