Comment 0 for bug 1987513

[Impact]

 * The Ubuntu RISC-V kernel carries out-of-tree patches to enable
   the two LEDs on the SiFive Unmatched board.

 * There are now an upstream solution to enable the LEDs that appears
   a little different from userspace. With the out-of-tree patches the
   three colours in the RGB LED appears as 3 different LEDs, but upstream
   models them as 1 RGB LED.

 * Replacing the out-of-tree patches with the upstream solution will
   make Ubuntu kernels behave like the upstream kernel going forward.

[Test Plan]

 * Boot Ubuntu on the Unmatched board and look at how the LEDs show up
   in /sys/class/leds

 * Check that both the green D12 and all three colours of D2 can still
   be controlled from userspace.

[Where problems could occur]

 * Users may have scripts setting up LEDs that will no longer work when
   updating to Kinetic with this change.