Add parameter to cleanup Qt5.4 doc package

Unnecessary files removed

Change-Id: Ie4044d53b34925643b1cc0c0675c52a1d7f79219
Reviewed-by: Jani Heikkinen <jani.heikkinen@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@theqtcompany.com>