default or selected kernelversion does not have config value CONFIG_MD_RAID6_PQ.
Result is shown for kernelversion 5.4.229

CONFIG_MD_RAID6_PQ (not configurable)

modulename: raid6_pq.ko

configname: CONFIG_MD_RAID6_PQ

Linux Kernel Configuration
└─>Device Drivers
└─>Multiple devices driver support (RAID and LVM)
└─>MD_RAID6_PQ
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
source code:
depends
CONFIG_MD

is selected by
CONFIG_ASYNC_RAID6_TEST

is depended by
CONFIG_MD_RAID456