[oe] [RFC] ipaq-sleep backlight control

[Andrew Paulsen]

I did a code cleanup on ipaq-sleep and added the option to use your
own backlight control script instead of gpe-conf to adjust brightness.

http://bugs.openembedded.org/show_bug.cgi?id=4101

I have since heard that all 2.6 devices use the standard
/sys/class/backlight/*/ method to control brightness and that we don't
need/want to support others.

So I have three options and I'd like some opinions:
1) Leave ipaq-sleep the way it is and ship a standard backlight
control script that can be overridden/changed per machine.  This still
allows the legacy gpe-conf method (the default right now)
2) Have ipaq-sleep write directly to /sys/class/backlight/*/ to tweak
the brightness and skip this whole mess
3) Have the option to select between 1&2 via conf file entry

Thanks!
Andrew