Add define to allow multipart ccm to work

Add (internal only) define to config.h which allows the temporary
implementation of CCM to work, by removing the buffer zeroization on tag
fail when decrypting. This will obviously be removed when multipart CCM
is properaly implemented

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/scripts/config.py b/scripts/config.py
index a77ead0..f9f0605 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -197,6 +197,7 @@
     'MBEDTLS_TEST_NULL_ENTROPY', # removes a feature
     'MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION', # influences the use of X.509 in TLS
     'MBEDTLS_X509_REMOVE_INFO', # removes a feature
+    'MBEDTLS_INTERNAL_CCM_NO_ZEROIZE_ON_TAG_FAIL', # lowers security of CCM
 ])
 
 def is_seamless_alt(name):