default or selected kernelversion does not have config value CONFIG_DRM_AMD_DC_DCN2_1.
Result is shown for kernelversion 6.9.2

DCN 2.1 family

configname: CONFIG_DRM_AMD_DC_DCN2_1

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>Display Engine Configuration
└─>DCN 2.1 family
In linux kernel since version 5.4 (release Date: 2019-11-24)  
Choose this option if you want to have
Renoir support for display engine