I tried to move the #ifdefs and the code
in firmware/powermgmt.c around and it was still
a big mess for hosted applications (RaaA/sim builds).
Create our own "power" thread as recently discussed on IRC.
Fixes the sleep timer for RaaA.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29501 a1c6a512-1295-4272-9138-f99709370657
