default or selected kernelversion does not have config value CONFIG_RT2500USB_LEDS.
Result is shown for kernelversion 5.3.7
Ralink rt2500 leds support
configname: CONFIG_RT2500USB_LEDS
Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Ralink rt2500 leds support
In linux kernel since version 2.6.26 (release Date: 2008-07-13)
This adds support for led triggers provided my mac80211.