CONFIG_ARCH_OMAP16XX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

OMAP16XX Based System

modulename: ocpi.ko

and/or

gpio16xx.ko

configname: CONFIG_ARCH_OMAP16XX

Linux Kernel Configuration
└─>TI OMAP Implementations
└─>OMAP16XX Based System
In linux kernel since version 2.6.12  
source code:
arch/arm/mach-omap/ocpi.c