1. Set the video and secure flag of the layer buffer flag properly.
2. Normalize the crop rectangle of the layer to even values.
3. Handle one pixel downscale usecase, as MDP hardware dont support it.
4. Set the hint flag for each layer qualified for SDE compoisition to
notify surfaceflinger to clear the layers destination region in FB.
Change-Id: I20239e79db3ea90e0d4fdcb6953b8b70d703b4fc
b56c7a9272