Android PM extensions

The following patch series adds two apis, wakelock and earlysuspend.
The Android platform uses the earlysuspend api to turn the screen
and some input devices on and off. The wakelock code determines when
to enter the full suspend state. 

These apis could also be useful to other platforms where the goal is
to enter full suspend whenever possible.

This is the second version posted to linux-pm. The main change from the first
version is that it no longer reuses /sys/power/state for the non-blocking
interface.

--
Arve Hjønnevåg

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