default or selected kernelversion does not have config value CONFIG_IPMI_LS2K.
Result is shown for kernelversion 6.18-rc7

Loongson-2K IPMI interface

configname: CONFIG_IPMI_LS2K

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>IPMI top-level message handler
└─>Loongson-2K IPMI interface
In linux kernel since version 6.12.57 (release Date: 2025-11-02)  
Provides a driver for Loongson-2K IPMI interfaces.