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

Cardbus IDE support (Delkin/ASKA/Workbit)

modulename: delkin_cb.ko

configname: CONFIG_BLK_DEV_DELKIN

Linux Kernel Configuration
└─>Device Drivers
└─>ATA/ATAPI/MFM/RLL support (DEPRECATED)
└─>Cardbus IDE support (Delkin/ASKA/Workbit)
In linux kernel since version 2.6.21.1 (release Date: 2007-04-27)  
Support for Delkin, ASKA, and Workbit Cardbus CompactFlash
Adapters. This may also work for similar SD and XD adapters.

source code:
depends
CONFIG_CARDBUS
CONFIG_IDE
CONFIG_PCI