CONFIG_ARCH_OMAP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
TI OMAP
modulename: gpio-omap.ko
configname: CONFIG_ARCH_OMAP
ARM system type
└─>TI OMAP
In linux kernel since version 2.6.12
Support for TI's OMAP platform (OMAP1/2/3/4).