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

Socionext UniPhier SoCs

configname: CONFIG_ARCH_UNIPHIER

Linux Kernel Configuration
└─>Socionext UniPhier SoCs
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Support for UniPhier SoC family developed by Socionext Inc.
(formerly, System LSI Business Division of Panasonic Corporation)