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

Support Versatile platform from device tree

modulename: versatile_dt.ko

configname: CONFIG_MACH_VERSATILE_DT

Linux Kernel Configuration
└─>Versatile platform type
└─>Support Versatile platform from device tree
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Include support for the ARM(R) Versatile/PB platform,
using the device tree for discovery

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