DelegAttest: Fix regression test suite build errors

RSE build is broken with the following config:
  -DTFM_ATTESTATION_SCHEME=CCA
  -DEXTRA_S_TEST_SUITE_PATH=<TF_M_EXTRAS_PATH>/partitions/delegated_attestation/test/secure

Change-Id: Id16a9af1a38b8782dfb96ae38b4511f943b43eae
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
3 files changed