default or selected kernelversion does not have config value CONFIG_DEBUG_CFQ_IOSCHED.
Result is shown for kernelversion 5.4.194

Debug CFQ Scheduling


Linux Kernel Configuration
└─>Enable the block layer
└─>IO Schedulers
└─>Debug CFQ Scheduling
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
Enable CFQ IO scheduling debugging in CFQ. Currently it makes
blktrace output more verbose.