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

CONFIG_PLAT_NOMADIK (not configurable)

modulename: gpio-nomadik.ko

configname: CONFIG_PLAT_NOMADIK

Linux Kernel Configuration
└─>PLAT_NOMADIK
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
Common platform code for Nomadik and other ST-Ericsson
platforms.

source code:
drivers/gpio/gpio-nomadik.c