[LEDE-ADM] License of patches

[Jo-Philipp Wich]

Hi,

> I would like to add this to the rules or to the patch submission 
> guideline:
> 
> ------------------------------- 
> Patches done to an existing software are always licensed under the
> same licenses as the original source code if it is not explicitly
> stated different. This should ensure that it possible to include the
> changes into the upstream project.
> -------------------------------

No objections from me.

~ Jo