RAUC: add a demo cert for bundle signing

This was generated by running:

  openssl req -x509 -newkey rsa:4096 -keyout rauc-key.pem -out rauc-cert.pem \
   -days 3650 -nodes -subj "/O=CzechLight/CN=rauc-demo"

Storing it in Git is obviously terribly insecure, which means that this
certificate can only ever be used for throwaway examples and *not* for
anything real (ha ha).

Change-Id: Ib6ac081f665e837f94d41346778a12a9aac588fb
2 files changed