default or selected kernelversion does not have config value CONFIG_IWL4965_DEBUG.
Result is shown for kernelversion 5.19-rc1

Enable full debugging output in iwl4965 driver

configname: CONFIG_IWL4965_DEBUG

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Enable full debugging output in iwl4965 driver
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
This option will enable debug tracing output for the iwl4965
driver.

This will result in the kernel module being ~100k larger. You can
control which debug output is sent to the kernel log by setting the
value in

/sys/bus/pci/drivers/${DRIVER}/debug_level

This entry will only exist if this option is enabled.

To set a value, simply echo an 8-byte hex value to the same file:

% echo 0x43fff > /sys/bus/pci/drivers/${DRIVER}/debug_level

You can find the list of debug mask values in:
drivers/net/wireless/iwlwifi/iwl-4965-debug.h

If this is your first time using this driver, you should say Y here
as the debug information can assist others in helping you resolve
any problems you may encounter.