default or selected kernelversion does not have config value CONFIG_LEDS_CROS_EC.
Result is shown for kernelversion 6.12-rc1

LED Support for ChromeOS EC

modulename: leds-cros_ec.ko

configname: CONFIG_LEDS_CROS_EC

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>LED Support for ChromeOS EC
In linux kernel since version 6.11 (release Date: 2024-09-15)  
This option enables support for LEDs managed by ChromeOS ECs.
All LEDs exposed by the EC are supported in multicolor mode.
A hardware trigger to switch back to the automatic behaviour is
provided.

To compile this driver as a module, choose M here: the module
will be called leds-cros_ec.

source code: