Indicate whether to apply layout change when setting divide position

To prevent it conflicting with shell transition when entering split, we
don't want to apply layout change when setting up divide position. Add a
boolean parameter to indicate whether to apply layout change or not for
setDividePosition.

Bug: 206487881
Bug: 208954095
Test: Trigger split screen, snap divider to non-middle position and
      observed no crash after dismissed and re-entered split screen.
Change-Id: I91ba735ade538e1bb3d5a5eba0c782c4456e1746