default or selected kernelversion does not have config value CONFIG_CXL_BIMODAL.
Result is shown for kernelversion 6.7-rc3

Support for bi-modal CAPI cards

configname: CONFIG_CXL_BIMODAL

Linux Kernel Configuration
└─>Device Drivers
└─>Misc devices
└─>Support for bi-modal CAPI cards
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Select this option to enable support for bi-modal CAPI cards, such as
the Mellanox CX-4.

depends
CONFIG_CXL
CONFIG_HOTPLUG_PCI_POWERNV