CONFIG_MACH_ARMADILLO800EVA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Armadillo-800 EVA board

modulename: board-armadillo800eva.ko

configname: CONFIG_MACH_ARMADILLO800EVA

Linux Kernel Configuration
└─>Armadillo-800 EVA board
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/mach-shmobile/board-armadillo800eva.c