CONFIG_ARCH_EP93XX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

EP93xx-based

configname: CONFIG_ARCH_EP93XX

Linux Kernel Configuration
└─>EP93xx-based
In linux kernel since version 2.6.17 (release Date: 2006-06-17)  
This enables support for the Cirrus EP93xx series of CPUs.