default or selected kernelversion does not have config value CONFIG_LEDS_BLINK_LGM.
Result is shown for kernelversion 5.13-rc2

LED support for Intel LGM SoC series

modulename: leds-lgm-sso.ko

configname: CONFIG_LEDS_BLINK_LGM

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>LED Blink support
└─>Device Tree and Open Firmware support
└─>LED support for Intel LGM SoC series
In linux kernel since version 5.12 (release Date: 2021-04-25)  
Parallel to serial conversion, which is also called SSO controller,
can drive external shift register for LED outputs.
This enables LED support for Serial Shift Output controller(SSO).

source code: