Inform SurfaceFlinger about displays which receive input

Right now, multiple display devices can share a layerstack.
This means that when constructing InputWindowInfo, its
impossible to know which display transform matches the
display viewport that inputflinger dispatches against. To
remedy this, have displaymanager inform surfaceflinger
which displays "receiveInput" using the same logic that
controls which display viewport it sends to inputflinger.

Bug: 179274888
Test: atest SetDisplayStateLockedTest
Change-Id: If0ffb1b5405f7e7dcdf8ea2f12c109d661a540fe