quick hack to use ACT LED for checking shutdown

[shigeru at os-hackers.jp]

Hi all,

I hope to know RaspberryPi is shutdowned with out display(or serial
console).

So I write a patch to use ACT LED which is on at boot time, and off at
shutdown time.
http://freebsd-current.os-hackers.jp/pub/FreeBSD/snapshots/20130815/raspberry-pi/patch-act_led-r254362.diff

It seems me working fine.

Please try it if you are interested my patch.

Thanks,
---
YAMAMOTO Shigeru <shigeru at os-hackers.jp>