Attest: Remove option flag support from tests

For more information please see the change with
the following ID in the main TF-M repository:
I5f6b3fdbed0a25e6a2aaa3609d6f6171d2be8f28

Change-Id: I09f445d4ad1fe33d722397fd8a895b37462d196b
Signed-off-by: David Vincze <david.vincze@arm.com>
3 files changed