CONFIG_ARCH_OMAP850 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

OMAP850 Based System

modulename: gpio7xx.ko

configname: CONFIG_ARCH_OMAP850

Linux Kernel Configuration
└─>TI OMAP1 specific features
└─>OMAP850 Based System
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
source code:
arch/arm/mach-omap1/gpio7xx.c