CONFIG_ARCH_STI is not available for the selected architecture x86.
Result is shown for architecture arm

STMicroelectronics Consumer Electronics SOCs

modulename: board-dt.ko

configname: CONFIG_ARCH_STI

Linux Kernel Configuration
└─>STMicroelectronics Consumer Electronics SOCs
In linux kernel since version 3.10 (release Date: 2013-06-30)
Include support for STiH41x SOCs like STiH415/416 using the device tree
for discovery
More information at <a href="https://www.kernel.org/doc/Documentation/arm/STiH41x">Documentation/arm/STiH41x</a> and
at <a href="https://www.kernel.org/doc/Documentation/devicetree
">Documentation/devicetree
</a>
source code: