default or selected kernelversion does not have config value CONFIG_AU1000_FIR.
Result is shown for kernelversion 6.0-rc6

Alchemy IrDA SIR/FIR

modulename: au1k_ir.ko
configname: CONFIG_AU1000_FIR

Linux Kernel Configuration
└─> Device Drivers
└─> Staging drivers
└─> IrDA (infrared) subsystem support
└─> Infrared-port device drivers
└─> Alchemy IrDA SIR/FIR

Say Y/M here to build support the IrDA peripheral on the
Alchemy Au1000 and Au1100 SoCs.
Say M to build a module; it will be called au1k_ir.ko

source code: