Accelbubble example only really works with a locked UI to portrait

On Android we have to do that via a custom AndroidManifest.

Change-Id: If436bdd494b3d167121bd8ee80f81c031a81f5d5
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>