tls: Avoid Intel reference in in self-signed certs

A step towards upstream OpenBMC shipping free of any branding (other
than OpenBMC branding) or company references.

Tested: Did not test
Change-Id: I4fea765949ff3ad94e3cd52fedec597a77db0e79
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>