default or selected kernelversion does not have config value CONFIG_MLX5_FPGA_TLS.
Result is shown for kernelversion 6.9.9

Mellanox Technologies TLS Innova support

configname: CONFIG_MLX5_FPGA_TLS

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Mellanox Technologies TLS Innova support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Build TLS support for the Innova family of network cards by Mellanox
Technologies. Innova network cards are comprised of a ConnectX chip
and an FPGA chip on one board. If you select this option, the
mlx5_core driver will include the Innova FPGA core and allow building
sandbox-specific client drivers.