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

TI OMAP4

modulename: omap4-restart.ko

and/or

opp4xxx_data.ko

and/or

pm44xx.ko

and/or

cpuidle44xx.ko

and/or

voltagedomains44xx_data.ko

and/or

powerdomains44xx_data.ko

and/or

clockdomains44xx_data.ko

and/or

dpll3xxx.ko

and/or

omap_hwmod_44xx_data.ko

configname: CONFIG_ARCH_OMAP4

Linux Kernel Configuration
└─>TI OMAP/AM/DM/DRA Family
└─>TI OMAP4
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
source code:
arch/arm/mach-omap2/omap4-restart.c


is selected by
CONFIG_VIDEO_OMAP4