default or selected kernelversion does not have config value CONFIG_HISAX_AVM_A1_CS.
Result is shown for kernelversion 6.9.9

AVM A1 PCMCIA cards

modulename: avma1_cs.ko

configname: CONFIG_HISAX_AVM_A1_CS

Linux Kernel Configuration
└─>Device Drivers
└─>ISDN support
└─>Old ISDN4Linux (deprecated)
└─>Passive cards
└─>AVM A1 PCMCIA cards
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This enables the PCMCIA client driver for the AVM A1 / Fritz!Card
PCMCIA cards.

source code: