CONFIG_MACH_VERSATILE_AB is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Support Versatile Application Baseboard for ARM926EJ-S

modulename: versatile_ab.ko

configname: CONFIG_MACH_VERSATILE_AB

Linux Kernel Configuration
└─>Versatile platform type
└─>Support Versatile Application Baseboard for ARM926EJ-S
In linux kernel since version 2.6.12  
Include support for the ARM(R) Versatile Application Baseboard
for the ARM926EJ-S.

source code:
arch/arm/mach-versatile/versatile_ab.c