IPv6: IOAM Pre-allocated Trace insertion support

configname: CONFIG_IPV6_IOAM6_LWTUNNEL

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>The IPv6 protocol
└─>IPv6: IOAM Pre-allocated Trace insertion support
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Support for the insertion of IOAM Pre-allocated Trace
Header using the lightweight tunnels mechanism.

If unsure, say N.