CONFIG_VTWM_VERSION_VT8500 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_VTWM_VERSION_VT8500 (not configurable)

modulename: devices-vt8500.ko

configname: CONFIG_VTWM_VERSION_VT8500

Linux Kernel Configuration
└─>VTWM_VERSION_VT8500
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
source code:

is selected by
CONFIG_FB_VT8500