default or selected kernelversion does not have config value CONFIG_NET_DSA_MV88E6131.
Result is shown for kernelversion 6.5.1

Marvell 88E6085/6095/6095F/6131 ethernet switch chip support

configname: CONFIG_NET_DSA_MV88E6131

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Distributed Switch Architecture drivers
└─>Marvell 88E6085/6095/6095F/6131 ethernet switch chip support
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
This enables support for the Marvell 88E6085/6095/6095F/6131
ethernet switch chips.