default or selected kernelversion does not have config value CONFIG_SENSORS_LAN966X.
Result is shown for kernelversion 6.9-rc4

Microchip LAN966x Hardware Monitoring

modulename: lan966x-hwmon.ko

configname: CONFIG_SENSORS_LAN966X

Linux Kernel Configuration
└─>Device Drivers
└─>Hardware Monitoring support
└─>Microchip LAN966x Hardware Monitoring
In linux kernel since version 5.2 (release Date: 2019-07-07)  
If you say yes here you get support for temperature monitoring
on the Microchip LAN966x SoC.

This driver can also be built as a module. If so, the module
will be called lan966x-hwmon.

source code:

depends
CONFIG_HWMON
CONFIG_COMPILE_TEST or CONFIG_SOC_LAN966