default or selected kernelversion does not have config value CONFIG_GIRBIL_DONGLE_OLD.
Result is shown for kernelversion 5.4.123

Greenwich GIrBIL dongle

modulename: girbil.ko


Linux Kernel Configuration
└─>Networking support
└─>IrDA (infrared) subsystem support
└─>Infrared-port device drivers
└─>Greenwich GIrBIL dongle
In linux kernel since version 2.6.12  
Say Y here if you want to build support for the Greenwich GIrBIL
dongle. To compile it as a module, choose M here. The Greenwich
dongle attaches to the normal 9-pin serial port connector, and can
currently only be used by IrTTY. To activate support for Greenwich
dongles you will have to insert "irattach -d girbil" in the
/etc/irda/drivers script.

source code: