default or selected kernelversion does not have config value CONFIG_NFP_NET_DEBUG.
Result is shown for kernelversion 6.4.14

Debug support for Netronome(R) NFP3200/NFP6000 NIC drivers

configname: CONFIG_NFP_NET_DEBUG

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Debug support for Netronome(R) NFP3200/NFP6000 NIC drivers
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Enable extra sanity checks and debugfs support in
Netronome(R) NFP3200/NFP6000 NIC PF and VF drivers.
Note: selecting this option may adversely impact
performance.