default or selected kernelversion does not have config value CONFIG_MLX_CPLD_PLATFORM.
Result is shown for kernelversion 6.7-rc3

Mellanox platform hotplug driver support

modulename: mlxcpld-hotplug.ko

configname: CONFIG_MLX_CPLD_PLATFORM

Linux Kernel Configuration
└─>Device Drivers
└─>X86 Platform Specific Device Drivers
└─>Mellanox platform hotplug driver support
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This driver handles hot-plug events for the power suppliers, power
cables and fans on the wide range Mellanox IB and Ethernet systems.

source code: