Test: Add SST test partition

Adds an SST test partition, which can be used to call the
sst_system_prepare() function from the SST test partition's
context.

Change-Id: Ib07a88e5f05fc181da2b9276279e57618fb059e4
Signed-off-by: Jamie Fox <jamie.fox@arm.com>
diff --git a/interface/include/tfm_veneers.h b/interface/include/tfm_veneers.h
index 5b0e2bf..b0b4867 100644
--- a/interface/include/tfm_veneers.h
+++ b/interface/include/tfm_veneers.h
@@ -131,6 +131,11 @@
 psa_status_t tfm_spm_irq_test_1_execute_test_scenario_veneer(psa_invec *in_vec, size_t in_len, psa_outvec *out_vec, size_t out_len);
 #endif /* TFM_ENABLE_IRQ_TEST */
 
+#ifdef TFM_PARTITION_TEST_SST
+/******** TFM_SP_SST_TEST ********/
+psa_status_t tfm_tfm_sst_test_prepare_veneer(psa_invec *in_vec, size_t in_len, psa_outvec *out_vec, size_t out_len);
+#endif /* TFM_PARTITION_TEST_SST */
+
 #ifdef __cplusplus
 }
 #endif