CONFIG_ATH79_DEV_LEDS_GPIO is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_ATH79_DEV_LEDS_GPIO (not configurable)

modulename: dev-leds-gpio.ko

configname: CONFIG_ATH79_DEV_LEDS_GPIO

Linux Kernel Configuration
└─>ATH79_DEV_LEDS_GPIO
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
source code:
arch/mips/ath79/dev-leds-gpio.c
depends
CONFIG_ATH79

is depended by
CONFIG_ATH79_MACH_AP136