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

Built-in device tree

configname: CONFIG_BUILTIN_DTB

Linux Kernel Configuration
└─>Boot options
└─>Built-in device tree
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Build a device tree into the Linux image.
This option should be selected if no bootloader is being used.
If unsure, say N.