default or selected kernelversion does not have config value CONFIG_LEDS_SEAD3.
Result is shown for kernelversion 6.4.14

LED support for the MIPS SEAD 3 board

modulename: leds-sead3.ko

configname: CONFIG_LEDS_SEAD3

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>LED support for the MIPS SEAD 3 board
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Say Y here to include support for the FLED and PLED LEDs on SEAD3 eval

This driver can also be built as a module. If so the module
will be called leds-sead3.

source code: