CONFIG_SOC_CANAAN_K210_DTB_BUILTIN is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv

Builtin device tree for the Canaan Kendryte K210

configname: CONFIG_SOC_CANAAN_K210_DTB_BUILTIN

Linux Kernel Configuration
└─>SoC selection
└─>Builtin device tree for the Canaan Kendryte K210
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Build a device tree for the Kendryte K210 into the Linux image.
This option should be selected if no bootloader is being used.
If unsure, say Y.