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

Allwinner SoCs

modulename: sunxi.ko

and/or

irq-sun4i.ko

and/or

irq-sunxi-nmi.ko

configname: CONFIG_ARCH_SUNXI

Linux Kernel Configuration
└─>Allwinner SoCs
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/mach-sunxi/sunxi.c