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

CONFIG_BUILTIN_DTB (not configurable)

configname: CONFIG_BUILTIN_DTB

Linux Kernel Configuration
└─>BUILTIN_DTB
In linux kernel since version 3.1 (release Date: 2011-10-24)  
depends
CONFIG_OF