CONFIG_MACH_NOMADIK_8815NHK is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

ST 8815 Nomadik Hardware Kit (evaluation board)

modulename: board-nhk8815.ko

configname: CONFIG_MACH_NOMADIK_8815NHK

Linux Kernel Configuration
└─>Nomadik boards
└─>ST 8815 Nomadik Hardware Kit (evaluation board)
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
source code:
arch/arm/mach-nomadik/board-nhk8815.c