default or selected kernelversion does not have config value CONFIG_BOOT_TRACER.
Result is shown for kernelversion 5.4.229

Trace boot initcalls

modulename: trace_boot.ko

configname: CONFIG_BOOT_TRACER

Linux Kernel Configuration
└─>Tracers
└─>Trace boot initcalls
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
This tracer helps developers to optimize boot times: it records
the timings of the initcalls and traces key events and the identity
of tasks that can cause boot delays, such as context-switches.

Its aim is to be parsed by the scripts/bootgraph.pl tool to
produce pretty graphics about boot inefficiencies, giving a visual
representation of the delays during initcalls - but the raw
/debug/tracing/trace text output is readable too.

You must pass in initcall_debug and ftrace=initcall to the kernel
command line to enable this on bootup.

source code: