test(realm): add tests for realm attestation

With this patch, TFTF adds two tests for realm attestation. One tests
the full process of retrieving the attestation token from the host. The
second one triggers a failure by calling RSI_ATTEST_TOKEN_CONTINUE
without calling RSI_ATTEST_TOKEN_INIT first.

Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Change-Id: I885402377af1f02ce7e90c80dbe1079fe4c1b178
diff --git a/realm/realm_payload_main.c b/realm/realm_payload_main.c
index 131f49b..3339b9a 100644
--- a/realm/realm_payload_main.c
+++ b/realm/realm_payload_main.c
@@ -368,6 +368,12 @@
 		case REALM_SME_UNDEF_ABORT:
 			test_succeed = test_realm_sme_undef_abort();
 			break;
+		case REALM_ATTESTATION:
+			test_succeed = test_realm_attestation();
+			break;
+		case REALM_ATTESTATION_FAULT:
+			test_succeed = test_realm_attestation_fault();
+			break;
 		default:
 			realm_printf("%s() invalid cmd %u\n", __func__, cmd);
 			break;