DPE: Make same cert_id reusable

When a layer gets finalized then set the cert_id
to an invalid value. This makes it possible to reuse
the same cert_id by clients. This can be useful when
a client is restarted and it sends the DPE commands
again with the same cert_id.

Change-Id: Ib8f2958f1dfdbd1f75e5024fd00381ee692928a9
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
1 file changed