feat(ff-a): add FFA_CONSOLE_LOG ABI test.

Add Cactus FF-A test to exercise FFA_CONSOLE_LOG ABI.

Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: Icad3b546c8eddd80c7a9cc3843d39679e91c6c2a
diff --git a/include/runtime_services/ffa_helpers.h b/include/runtime_services/ffa_helpers.h
index 0ad8c42..1635bf8 100644
--- a/include/runtime_services/ffa_helpers.h
+++ b/include/runtime_services/ffa_helpers.h
@@ -685,6 +685,9 @@
 struct ffa_value ffa_notification_get(ffa_id_t receiver, uint32_t vcpu_id,
 				      uint32_t flags);
 struct ffa_value ffa_notification_info_get(void);
+
+struct ffa_value ffa_console_log(const char* message, size_t char_count);
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* FFA_HELPERS_H */