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

ARM Ltd. Versatile Express family

modulename: v2m.ko

and/or

platsmp-vexpress.ko

and/or

clk-vexpress.ko

configname: CONFIG_ARCH_VEXPRESS

ARM system type
└─>ARM Ltd. Versatile Express family
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
This enables support for the ARM Ltd Versatile Express boards.


depends
 or CONFIG_ARCH_MULTI_V7