Mark setInputWindows of IInputFlinger interface as "oneway".

SurfaceFlinger is the caller of this method, it uses the listener callback to ensure the
ordering when needed.
SurfaceFlinger calls this only every VSync, so overflow of binder's oneway buffer
shouldn't be a concern.

Bug: 161494456
Test: atest inputflinger_tests, atest SurfaceFlinger_test
Change-Id: I4392bb3dfec9d08b1288f1bc93ac952913c1c049