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

CONFIG_ARCH_OMAP_OTG (not configurable)

configname: CONFIG_ARCH_OMAP_OTG

Linux Kernel Configuration
└─>TI OMAP Common Features
└─>ARCH_OMAP_OTG
In linux kernel since version 2.6.12  

is selected by
CONFIG_ISP1301_OMAP

is depended by
CONFIG_ARCH_OMAP16XX