dice: default router setup patch 1/10 from Philippe Carriere: This function forces...

dice: default router setup patch 1/10 from Philippe Carriere: This function forces the creation of a destination whatever is the present existing status. This will be useful (in view of a 'hardware default setting' function) since the same destination is sometimes effectively duplicated in the router space for some devices (Focusrite Saffire Pro 24 and Pro 40, for instance).

git-svn-id: svn+ssh://ffado.org/ffado/trunk@2134 2be59082-3212-0410-8809-b0798e1608f0