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

Tekram IrMate 210B dongle

modulename: tekram.ko


Linux Kernel Configuration
└─>Networking support
└─>IrDA (infrared) subsystem support
└─>Infrared-port device drivers
└─>Tekram IrMate 210B dongle
In linux kernel since version 2.6.12  
Say Y here if you want to build support for the Tekram IrMate 210B
dongle. To compile it as a module, choose M here. The Tekram dongle
attaches to the normal 9-pin serial port connector, and can
currently only be used by IrTTY. To activate support for Tekram
dongles you will have to start irattach like this:
"irattach -d tekram".

source code: