Suspend block api (version 7)

This patch series adds a suspend-block api that provides the same
functionality as the android wakelock api. This version has some
changes from, or requested by, Rafael. The most notable changes are:
- DEFINE_SUSPEND_BLOCKER and suspend_blocker_register have been added
  for statically allocated suspend blockers. 
- suspend_blocker_destroy is now called suspend_blocker_unregister
- The user space mandatory _INIT ioctl has been replaced with an
  optional _SET_NAME ioctl.

I kept the ack and reviewed by tags on two of the patches even though
there were a few cosmetic changes.

--
Arve Hjønnevåg <arve@android.com>

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