Remove usage of scoped connections.

Tracking SurfaceFlinger changes. Now to construct a child surface
we need the SurfaceControl as opposed to just the surface, and so
we parcel the SurfaceControl across relayout.

Test: Manual
Bug: 62536731
Bug: 111373437
Bug: 111297488
Change-Id: I0a034767e92becec63071d7b1e3e71b95d505b77