test: ECDSA driver only: disable ECP_RESTARTABLE

This is not yet supported in driver only implementation

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 883d58b..e459fc7 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -2108,6 +2108,7 @@
     # TODO: make these work - #6862
     scripts/config.py unset MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
     scripts/config.py unset MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED
+    scripts/config.py unset MBEDTLS_ECP_RESTARTABLE
 }
 
 # Keep in sync with component_test_psa_crypto_config_reference_ecdsa_use_psa