update copyright headers

@cptspiff
should these headers be replaced or updated and keeping current copyright?

https://github.com/xbmc/xbmc/blob/master/xbmc/network/upnp/UPnP.cpp
https://github.com/xbmc/xbmc/blob/master/xbmc/network/upnp/UPnP.h
https://github.com/xbmc/xbmc/blob/master/xbmc/network/upnp/UPnPPlayer.cpp
https://github.com/xbmc/xbmc/blob/master/xbmc/network/upnp/UPnPPlayer.h