Add config.h option MBEDTLS_ECP_NO_INTERNAL_RNG

No effect so far, except on dependency checking, as the feature it's meant to
disable isn't implemented yet (so the descriptions in config.h and the
ChangeLog entry are anticipation for now).

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/scripts/config.py b/scripts/config.py
index 7f94587..3d297dc 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -173,6 +173,7 @@
     'MBEDTLS_DEPRECATED_REMOVED', # conflicts with deprecated options
     'MBEDTLS_DEPRECATED_WARNING', # conflicts with deprecated options
     'MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED', # influences the use of ECDH in TLS
+    'MBEDTLS_ECP_NO_INTERNAL_RNG', # removes a feature
     'MBEDTLS_ECP_RESTARTABLE', # incompatible with USE_PSA_CRYPTO
     'MBEDTLS_ENTROPY_FORCE_SHA256', # interacts with CTR_DRBG_128_BIT_KEY
     'MBEDTLS_HAVE_SSE2', # hardware dependency