Remove the amss field from tcpip.tcp.handshake as it was unused
Remove the amss field from tcpip.tcp.handshake as it was unused

The amss field in the tcpip.tcp.handshake was not used anywhere. Removed it to
not cause confusion with the amss field in the tcpip.tcp.endpoint struct, which
was documented to be used (and is actually being used) for the same purpose.

PiperOrigin-RevId: 276577088

google/netstack