[services] Drop xbmcloaded "service".

This was moved to the "Upstart bridge" add-on with commit
anaconda/xbian-package-upstart-xbmc-bridge@03d4ebbcfb8a6f0d873bd14fa8aaec241913c6cd.
Merge pull request #25 from anaconda/kill-xbmc-loaded

[services] Drop xbmcloaded "service".