default or selected kernelversion does not have config value CONFIG_IEEE802154_AT86RF230_DEBUGFS.
Result is shown for kernelversion 6.9.9
AT86RF230 debugfs interface
configname: CONFIG_IEEE802154_AT86RF230_DEBUGFS
Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>AT86RF230 debugfs interface
In linux kernel since version 4.1 (release Date: 2015-06-21)
This option compiles debugfs code for the at86rf230 driver.