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

batman-adv debugfs entries

configname: CONFIG_BATMAN_ADV_DEBUGFS

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>batman-adv debugfs entries
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Enable this to export routing related debug tables via debugfs.
The information for each soft-interface and used hard-interface can be
found under batman_adv/

If unsure, say N.