CONFIG_SOC_KENDRYTE_K210_DTB is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv

CONFIG_SOC_KENDRYTE_K210_DTB (not configurable)

configname: CONFIG_SOC_KENDRYTE_K210_DTB

Linux Kernel Configuration
└─>SoC selection
└─>SOC_KENDRYTE_K210_DTB
In linux kernel since version 5.1 (release Date: 2019-05-05)