DPE: Test: Add negative test case with mixed custom argument

Add test case to verify that mixing of optional cert_id argument for
DeriveContext call is not allowed when a certificate is not finalised.

Signed-off-by: Maulik Patel <maulik.patel@arm.com>
Change-Id: I19695f0edfc7819160124d0c4c2aa98246ea45ce
3 files changed