Fix crash on boot

There is a race condition where the sysfs-vsync thread accesses a value
(in particular a function ptr) that may not have been set yet as this
is done externally.

Change-Id: If1afb1533344e994398b9b6f5bd3dfb125313416
Revert "hwc: Update to API 1.1"

This reverts commit 99f63f2a4fb8037505b34e7665e9b1d717f28d6c.
Derp, this isn't ready to go in.
Merge "Fix crash on boot" into cm-11.0