CONFIG_ALCHEMY_GPIO_AU1000 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_ALCHEMY_GPIO_AU1000.
Result is shown for kernelversion 5.4.194

CONFIG_ALCHEMY_GPIO_AU1000 (not configurable)

modulename: gpiolib-au1000.ko

configname: CONFIG_ALCHEMY_GPIO_AU1000

Linux Kernel Configuration
└─>ALCHEMY_GPIO_AU1000
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
source code:
arch/mips/alchemy/common/gpiolib-au1000.c