Test: Create SST test service

This patch adds a new secure service for use by
the SST test suites. The initial implementation
enables testing of the SST access by reference
feature.

Change-Id: I41663255bd65aa72168ba6d32c47b23e65586001
Signed-off-by: Jamie Fox <jamie.fox@arm.com>
diff --git a/CommonConfig.cmake b/CommonConfig.cmake
index f479815..bb56736 100644
--- a/CommonConfig.cmake
+++ b/CommonConfig.cmake
@@ -49,6 +49,7 @@
 set (CORE_TEST_SERVICES OFF)
 set (CORE_TEST_POSITIVE OFF)
 set (CORE_TEST_INTERACTIVE OFF)
+set (SST_TEST_SERVICES OFF)
 
 if (REGRESSION)
 	set(SERVICES_TEST_ENABLED ON)
@@ -88,6 +89,7 @@
 if (SERVICE_TEST_NS)
 	add_definitions(-DSERVICES_TEST_NS)
 	set(TEST_FRAMEWORK_NS ON)
+	set(SST_TEST_SERVICES ON)
 endif()
 
 if(TEST_FRAMEWORK_S)
@@ -102,6 +104,10 @@
 	add_definitions(-DCORE_TEST_SERVICES)
 endif()
 
+if (SST_TEST_SERVICES)
+	add_definitions(-DSST_TEST_SERVICES)
+endif()
+
 if (BL2)
 	add_definitions(-DBL2)
 endif()