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

Boot off-board chipsets first support (DEPRECATED)

configname: CONFIG_BLK_DEV_OFFBOARD

Linux Kernel Configuration
└─>Device Drivers
└─>ATA/ATAPI/MFM/RLL support (DEPRECATED)
└─>Boot off-board chipsets first support (DEPRECATED)
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Normally, IDE controllers built into the motherboard (on-board
controllers) are assigned to ide0 and ide1 while those on add-in PCI
cards (off-board controllers) are relegated to ide2 and ide3.
Answering Y here will allow you to reverse the situation, with
off-board controllers on ide0/1 and on-board controllers on ide2/3.
This can improve the usability of some boot managers such as lilo
when booting from a drive on an off-board controller.

Note that, if you do this, the order of the hd* devices will be
rearranged which may require modification of fstab and other files.

Please also note that this method of assuring stable naming of
IDE devices is unreliable and use other means for achieving it
(i.e. udev).

If in doubt, say N.