CONFIG_LEDS_CPU is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_LEDS_CPU.
Result is shown for kernelversion 6.2.5

CPU usage LED

configname: CONFIG_LEDS_CPU

Linux Kernel Configuration
└─>Kernel Features
└─>CPU usage LED
In linux kernel since version 2.6.12  
If you say Y here, the red LED will be used to give a good real
time indication of CPU usage, by lighting whenever the idle task
is not currently executing.

The LART uses the same LED for both Timer LED and CPU usage LED
functions. You may choose to use both, but the Timer LED function
will overrule the CPU usage LED.