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/ff/ipc/testsuite.db b/api-tests/ff/ipc/testsuite.db
index f8a3013..72216ed 100644
--- a/api-tests/ff/ipc/testsuite.db
+++ b/api-tests/ff/ipc/testsuite.db
@@ -108,5 +108,7 @@
 test_i086, panic_test
 test_i087, panic_test
 test_l088
+test_i089, panic_test
+test_i090, panic_test
 
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