CONFIG_ARCH_SUNXI is not available for the selected architecture x86.
Result is shown for architecture riscv

Allwinner sun20i SoCs

modulename: sunxi.ko

configname: CONFIG_ARCH_SUNXI

Linux Kernel Configuration
└─>SoC selection
└─>Allwinner sun20i SoCs
In linux kernel since version 3.1 (release Date: 2011-10-24)
This enables support for Allwinner sun20i platform hardware,
including boards based on the D1 and D1s SoCs.