USR0/1/2/3 aren't avalable on latest version of kernel

I've updated kernel for BeagleBone Black from https://debian.beagleboard.org/images/bone-debian-10.3-iot-armhf-2020-04-06-4gb.img.xz
Try execute next script
```
#!/usr/bin/env node
////////////////////////////////////////
// blinkLED.js
// Blinks the USR LEDs and P9_14.
// Wiring: P9_14 connects to the plus lead of an LED. The negative lead of the
// LED goes to a 220 Ohm resistor. The other lead of the resistor goes
// to ground.
// Setup:
// See:
////////////////////////////////////////
const b = require('bonescript');

//const leds = ["USR0", "USR1", "USR2", "USR3"];
const leds = ["P8_14"];

for(var i in leds) {
b.pinMode(leds[i], b.OUTPUT);
}

var state = b.HIGH;
for(var i in leds) {
b.digitalWrite(leds[i], state);
}

setInterval(toggle, 250);

function toggle() {
if(state == b.LOW)
state = b.HIGH;
else
state = b.LOW;
for(var i in leds) {
b.digitalWrite(leds[i], state);
}
}
```
And have next messages
```
error: Unable to find LED beaglebone:green:usr0
error: Unable to find LED beaglebone:green:usr1
error: Unable to find LED beaglebone:green:usr2
error: Unable to find LED beaglebone:green:usr3
error: Unable to find gpio: /sys/class/leds/beaglebone:green:usr0/brightness
error: Unable to write to /sys/class/leds/beaglebone:green:usr0/brightness
error: Unable to find gpio: /sys/class/leds/beaglebone:green:usr1/brightness
error: Unable to write to /sys/class/leds/beaglebone:green:usr1/brightness
error: Unable to find gpio: /sys/class/leds/beaglebone:green:usr2/brightness
error: Unable to write to /sys/class/leds/beaglebone:green:usr2/brightness
error: Unable to find gpio: /sys/class/leds/beaglebone:green:usr3/brightness
error: Unable to write to /sys/class/leds/beaglebone:green:usr3/brightness
error: Unable to write to /sys/class/leds/beaglebone:green:usr0/brightness
error: Unable to write to /sys/class/leds/beaglebone:green:usr1/brightness
error: Unable to write to /sys/class/leds/beaglebone:green:usr2/brightness
error: Unable to write to /sys/class/leds/beaglebone:green:usr3/brightness
```

Start by reproducing the provided blinkLED.js script with the BeagleBone Debian image, then inspect /sys/class/leds for the expected beaglebone:green:usr0 through usr3 entries. Compare those entries with the LED names bonescript uses; done means the USR LED operations work on the reported kernel or the incompatibility is clearly documented.

Written by the indexing model from the issue text.