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 b/tf_config/fvp-tc4-tbb
index d90d0e7..85dee26 100644
--- a/tf_config/fvp-tc4-tbb
+++ b/tf_config/fvp-tc4-tbb
@@ -9,3 +9,4 @@
 TARGET_PLATFORM=4
 TRUSTED_BOARD_BOOT=1
 CSS_LOAD_SCP_IMAGES=0
+ENABLE_STACK_PROTECTOR=strong