BL2: Add BL2 test code

Change-Id: I96f781b5de80e4a20121c596b1790259e98173f3
Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index be3bf75..ef673e0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -92,7 +92,7 @@
 add_subdirectory(tools)
 add_subdirectory(secure_fw)
 
-if(NS OR TFM_S_REG_TEST OR TFM_NS_REG_TEST)
+if(NS OR TFM_S_REG_TEST OR TFM_NS_REG_TEST OR TEST_BL2)
     add_subdirectory(${TFM_TEST_REPO_PATH} ${CMAKE_CURRENT_BINARY_DIR}/tf-m-tests)
 endif()