CONFIG_ARCH_MULTI_V5 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_MULTI_V5.
Result is shown for kernelversion 6.9-rc1

ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)

configname: CONFIG_ARCH_MULTI_V5

Linux Kernel Configuration
└─>Platform selection
└─>ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)
In linux kernel since version 3.1 (release Date: 2011-10-24)