Automatically choose fastest RAID6 PQ functions

configname: CONFIG_RAID6_PQ_BENCHMARK

Linux Kernel Configuration
└─>Library routines
└─>Automatically choose fastest RAID6 PQ functions
In linux kernel since version 5 (release Date: 2019-03-03)  
Benchmark all available RAID6 PQ functions on init and choose the
fastest one.

depends
CONFIG_RAID6_PQ