default or selected kernelversion does not have config value CONFIG_HISAX_FRITZPCI.
Result is shown for kernelversion 6.9.9

AVM PnP/PCI (Fritz!PnP/PCI)

configname: CONFIG_HISAX_FRITZPCI

Linux Kernel Configuration
└─>Device Drivers
└─>ISDN support
└─>Old ISDN4Linux (deprecated)
└─>Passive cards
└─>AVM PnP/PCI (Fritz!PnP/PCI)
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This enables HiSax support for the AVM "Fritz!PnP" and "Fritz!PCI".
See <file:Documentation/isdn/README.HiSax> on how to configure it.