FIH: Improve labelling for testing tool

Change-Id: I1c89eb8daaa941b99f6c513a946d9896af54de7f
Signed-off-by: Raef Coles <raef.coles@arm.com>
Signed-off-by: David Hu <david.hu@arm.com>
diff --git a/secure_fw/spm/cmsis_func/main.c b/secure_fw/spm/cmsis_func/main.c
index 2a809dd..047207e 100644
--- a/secure_fw/spm/cmsis_func/main.c
+++ b/secure_fw/spm/cmsis_func/main.c
@@ -155,6 +155,9 @@
         tfm_core_panic();
     }
 
+    /* All isolation should have been set up at this point */
+    FIH_LABEL_CRITICAL_POINT();
+
     /* Print the TF-M version */
     SPMLOG_INFMSG("\033[1;34mBooting TFM v"VERSION_FULLSTR"\033[0m\r\n");