docs(auth): align TBBR CoT names to match the code

Update the section describing the TBBR chain of trust to use the same
terminology as in the code and the specification.

Also refresh the description of some of the certificates to include the
pieces of data they contain today. When this document was originally
written, TF-A did not support configuration files, which is why none of
the certificates included any configuration file hash at that time.

Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: Ia85f88c933abd8d8d6727252a7d41fb9f0ce4287
1 file changed