fix(tc): add tests for 'enable stack protector' patch

Change-Id: I7518c83e28c21acb7f282a39511d3454837b1952
Signed-off-by: Icen.Zeyada <Icen.Zeyada2@arm.com>
diff --git a/tf_config/fvp-tc4-tbb-dpe b/tf_config/fvp-tc4-tbb-dpe
index 1435e98..265f9fe 100644
--- a/tf_config/fvp-tc4-tbb-dpe
+++ b/tf_config/fvp-tc4-tbb-dpe
@@ -11,3 +11,4 @@
 TARGET_PLATFORM=4
 TRUSTED_BOARD_BOOT=1
 CSS_LOAD_SCP_IMAGES=0
+ENABLE_STACK_PROTECTOR=strong