CONFIG_ARCH_OMAP4 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

TI OMAP4

modulename: cm4xxx.ko

configname: CONFIG_ARCH_OMAP4

OMAP System Type
└─>TI OMAP4
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
source code:
arch/arm/mach-omap2/cm4xxx.c

is selected by
CONFIG_LOCAL_TIMERS