CONFIG_ARCH_OMAP730 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

OMAP730 Based System

modulename: gpio7xx.ko

configname: CONFIG_ARCH_OMAP730

Linux Kernel Configuration
└─>TI OMAP1
└─>TI OMAP1 specific features
└─>OMAP730 Based System
In linux kernel since version 2.6.12  
source code:
arch/arm/mach-omap1/gpio7xx.c