[roll] Roll fuchsia [netstack3][tcp] Allow same 4-tuple but different devices

Before this change, the TCP demuxer only allows connections with
unique 4-tuples, this is stricter than it needs be on a system with
multiple network interfaces: connections should be able to coexist
with unique 5-tuples.

In reality, it is possible that two hosts with the same link-local
addrs exist on the two networks that we are connected to through
different interfaces. If the 2 hosts both try to establish a
connection with us, the second one is rejected and trips an invariant
assertion in the demux code.

Instead of relaxing the invariant assertion, which could allow other
types of bugs without us noticing, we allow such connections to be
created on the system as long as the 5-tuple is unique. It is not
changed that 2 connections still conflict with each other if both of
them have the same 4-tuple but one has a device bound while the other
is not.

Original-Fixed: 475191687, 321240038
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1477438
Original-Revision: 64a730cc3a1b7c49aa030cd3d1564440aeed1dd0
GitOrigin-RevId: 5b4223dfa6ddc55d2bf93a125022d788c8ac974a
Change-Id: I29005838391df22875fc2bf016524e1b1da6c4d4