default or selected kernelversion does not have config value CONFIG_ATM_FORE200E_PCA_FW.
Result is shown for kernelversion 5.5.18

Pathname of user-supplied binary firmware

configname: CONFIG_ATM_FORE200E_PCA_FW

Linux Kernel Configuration
└─> Device Drivers
└─> Network device support
└─> ATM drivers
└─> Pathname of user-supplied binary firmware

This defines the pathname of an alternative PCA-200E binary
firmware image supplied by the user. This pathname may be
absolute or relative to the drivers/atm directory.

The driver comes with an adequate firmware image, so normal users do
not have to supply an alternative one. They just say Y to "Use
default PCA-200E firmware" instead.