Build: Remove handling of FORWARD_PROT_MSG option

Signed-off-by: Mark Horvath <mark.horvath@arm.com>
Change-Id: I26f9f0e3d3c1d85b5cbf11f4879c95ab0e3e9158
diff --git a/docs/tfm_test_suites_addition.rst b/docs/tfm_test_suites_addition.rst
index aaf0cdb..99929c5 100644
--- a/docs/tfm_test_suites_addition.rst
+++ b/docs/tfm_test_suites_addition.rst
@@ -113,8 +113,7 @@
     #. TF-M partitions configurations like ``TFM_PARTITION_CRYPTO``,
        ``TFM_PARTITION_INITIAL_ATTESTATION``, etc.
     #. TF-M build mode configuration like ``TFM_LIB_MODEL``.
-    #. TF-M other configurations like ``TFM_PARTITION_FIRMWARE_UPDATE``,
-       ``FORWARD_PROT_MSG``, etc.
+    #. TF-M other configurations like ``TFM_PARTITION_FIRMWARE_UPDATE``, etc.
 
 #. ``tf-m-tests/config/default_ns_test_config.cmake`` or
    ``tf-m-tests/config/default_s_test_config.cmake``: It is required to give