default or selected kernelversion does not have config value CONFIG_UNISYS_VISORUTIL.
Result is shown for kernelversion 6.4.14

Unisys visorutil driver

modulename: visorutil.ko

configname: CONFIG_UNISYS_VISORUTIL

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Unisys SPAR driver support
└─>Unisys visorutil driver
In linux kernel since version 3.15 (release Date: 2014-06-08)  
If you say Y here, you will enable the Unisys visorutil driver.

source code:
drivers/staging/unisys/visorutil/