default or selected kernelversion does not have config value CONFIG_NET_CLS_ROUTE.
Result is shown for kernelversion 5.4.69

CONFIG_NET_CLS_ROUTE (not configurable)

configname: CONFIG_NET_CLS_ROUTE

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>QoS and/or fair queueing
└─>NET_CLS_ROUTE
In linux kernel since version 2.6.12