Fixing multiwindow drag operation during with rotation.

> Finishing activity when rotation preference change. This ensures that
  any prefenrece change is immediately applied instead of waiting for resume
  as the new activity is always started with proper setting.
> Clearing task when starting drag in landscape mode. This ensures that a new
  activity instance is started in this case, which overrides previous locked
  rotation by launcher activity.
> Handling drag request in onCreate and enabling rotation based on it.
> Clearing any request from the launcher intent once the drag operation
  is complete

Bug: 36226746
Change-Id: I69f56c13827c25f3e1bc84935cb2acc59b6bd349