CONFIG_ARCH_VT8500_SINGLE is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_VT8500_SINGLE.
Result is shown for kernelversion 5.17.13

VIA/WonderMedia 85xx

configname: CONFIG_ARCH_VT8500_SINGLE

ARM system type
└─>VIA/WonderMedia 85xx
In linux kernel since version 3.8 (release Date: 2013-02-18)  
Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.