hwc: Manipulate external display position for split and src split

1. Query the actual dimensions of external display and manipulate
   the external display position, if MDP downscale is enabled
2. Manipulate the external display position if Actionsafe dimensions
   are set for external display
3. Manipulate the external display position if external orientation
   is set for external display.

Change-Id: I954b13950d61f4c38745d86e0c2d6090a5698ff0
1 file changed