CONFIG_SH_DEVICE_TREE is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

Board Described by Device Tree

modulename: of-generic.ko

configname: CONFIG_SH_DEVICE_TREE

Linux Kernel Configuration
└─>Board support
└─>Board Described by Device Tree
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Select Board Described by Device Tree to build a kernel that
does not hard-code any board-specific knowledge but instead uses
a device tree blob provided by the boot-loader. You must enable
drivers for any hardware you want to use separately. At this
time, only boards based on the open-hardware J-Core processors
have sufficient driver coverage to use this option; do not
select it if you are using original SuperH hardware.

source code: