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

HFC PCI-Bus cards

configname: CONFIG_HISAX_HFC_PCI

Linux Kernel Configuration
└─>Device Drivers
└─>ISDN support
└─>Old ISDN4Linux (deprecated)
└─>Passive cards
└─>HFC PCI-Bus cards
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This enables HiSax support for the HFC-S PCI 2BDS0 based cards.

For more information see under
<file:Documentation/isdn/README.hfc-pci>.