Add the framework/tests/include path to testsuites

These need to include from the framework path as this is where most test
helpers have been moved to.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 1eb5e3b..c13d643 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -318,6 +318,7 @@
     # them as PUBLIC.
     target_include_directories(test_suite_${data_name}
         PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include
+        PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../framework/tests/include
         PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../library)
     # Request C11, which is needed for memory poisoning tests
     set_target_properties(test_suite_${data_name} PROPERTIES C_STANDARD 11)