SurfaceFlinger: Layer::getFrameRate() with relatives

If an app set a framerate on a layer, then getFrameRate() on
ancestors/successors of this layer should return NoVote to allow the
refresh rate heuristic to be based on the the actual layers that voted.

Bug: 151274728
Test: Swappy with ANativeWindow_setFrateRate
Change-Id: Icfdf8e8fd4d92ba520bbc894bb9971b980691518