SF: VSR: VSyncTracker can reorients itself

When an incoming timestamp doesnt make sense, VSyncPredictor
will now report this out to VSyncReactor (VSR), which will
turn on HWVsync accordingly. DispSync would turn this on as a normal
course of operations, VSyncReactor only turns this on as an error
handling condition (where DispSync could recover better, more info see
linked bugs)

Bug: 147891587
Bug: 147734678
Bug: 144707443
Test: 3 new unit
Test: uibench run with VSR on

Change-Id: Ia554b3262875e01de5cd8e30af99616ff23d2d27