configure CPU IDLE governor in cpufreq module

[Bogdan107]

Describe the bug
CPU frequency governor configured per cpu in /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_governor file.
CPU IDLE governor configured per system in /sys/devices/system/cpu/cpuidle/current_governor file.
More info:

• https://www.kernel.org/doc/html/latest/admin-guide/pm/cpuidle.html
• https://community.ibm.com/community/user/power/blogs/pratik-sampat1/2021/03/05/weighted-idle-governor

CPU scalling governor configured in cpufreq module in (BATT|LM_AC|NOLM)_CPU_GOVERNOR variables.
I want to customize CPU IDLE governor too.

$ zgrep CONFIG_CPU_IDLE /proc/config.gz
CONFIG_CPU_IDLE=y
CONFIG_CPU_IDLE_GOV_LADDER=y
CONFIG_CPU_IDLE_GOV_MENU=y
CONFIG_CPU_IDLE_GOV_TEO=y
# CONFIG_CPU_IDLE_THERMAL is not set

$ cat /sys/devices/system/cpu/cpuidle/available_governors 
ladder menu teo

$ cat /sys/devices/system/cpu/cpuidle/current_governor 
ladder

Expected behavior
I want to customize CPU IDLE governor by (BATT|LM_AC|NOLM)_CPU_IDLE_GOVERNOR variables in cpufreq module:

BATT_CPU_IDLE_GOVERNOR=teo
LM_AC_CPU_IDLE_GOVERNOR=ladder
NOLM_CPU_IDLE_GOVERNOR=menu