kernel driver for support PCEngine APU2 LEDs

import from https://daduke.org/linux/apu2/

PC Engines apu2 Hardware related stuff on the PC Engines apu2 board apu2 front LEDs kernel module to access the 3 front LEDs on the apu2 board and a small daemon to use LEDs 2 and 3 as network up/downstream indicators. Download is here, just run

LED 1 as a load indicator:

and run apuled like this: