wakelock: add wakelock blacklist

   blacklist config file is  /system/etc/wakelock_blacklist or /data/system/wakelock_blacklist.

  blacklist item can be as:
        wakelock_name : process_name1 process_name2
   This means wakelock from process1 or process2
   If  supply prefix '-' for wakelock_name, the blacklist item will be remove.
   Wakelock and process split by a colon char.
   User space interface is /sys/power/wakelock_blacklist.

Change-Id: I5707e0618df7a5bb5996c67e299c145b1c4ba3b6
Revert "Revert "Merge omapzoom-changes into drivers/video/omap2/dss/dispc.c""

Reverting this caused graphical artifacts. Bring back the sync to
omapzoom and leave only a problematic piece disabled which can lead
to kernel panics.

This mostly reverts commit 780543728d90e3d972e2b8261c6af131b30b92c0.

Change-Id: If01cc1d5f21ad6b90ddc597ebd5341bcf70e8bb5