CONFIG_ARCH_SUNXI is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Allwinner sunxi 64-bit SoC Family

modulename: sunxi.ko

and/or

irq-sun4i.ko

and/or

irq-sun6i-r.ko

and/or

irq-sunxi-nmi.ko

configname: CONFIG_ARCH_SUNXI

Linux Kernel Configuration
└─>Platform selection
└─>Allwinner sunxi 64-bit SoC Family
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This enables support for Allwinner sunxi based SoCs like the A64.

selects
CONFIG_ARCH_HAS_RESET_CONTROLLER
CONFIG_GENERIC_IRQ_CHIP
CONFIG_IRQ_DOMAIN_HIERARCHY
CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
CONFIG_PINCTRL
CONFIG_RESET_CONTROLLER
CONFIG_SUN4I_TIMER