SurfaceFlinger: tree vote for FrameRateCompatibility::ExactOrMultiple

Layers that voted with FrameRateCompatibility::ExactOrMultiple
will still allow touch boost as those layers are typically not
interactive and therefore touch is probably meant for a different
layer. For the same reasoning, we should continue to heuristically
calculate frame rate for layers in the same tree.

Bug: 157254751
Test: run Swappy with statistics overlay and observe refresh rate
Test: run YouTube, play a video, scrolling the recommended videos and observe refresh rate
Change-Id: I9311512a663eba61dfcae6277a52c077e135a244