IPC: Tests addition and updates for PSA FF 1.0

- Tests addition and updates for PSA FF 1.0
- Remove unused platform files
- Update READMEs for security implication note
- Minor bug fixes
diff --git a/api-tests/val/common/val.h b/api-tests/val/common/val.h
index 243c584..c9bcc33 100644
--- a/api-tests/val/common/val.h
+++ b/api-tests/val/common/val.h
@@ -178,6 +178,12 @@
 } test_isolation_level_t;
 
 typedef enum {
+    LEVEL1 = 0x1,
+    LEVEL2,
+    LEVEL3,
+} isolation_level_t;
+
+typedef enum {
     /* VAL uses this boot flag to mark first time boot of the system  */
     BOOT_UNKNOWN                       = 0x1,
     /* VAL/Test uses this boot flag to catch any unwanted system reboot - SIM ERROR Cases*/