Revert "ecp: Remove dependency on TLS and X.509"

This reverts commit de0a41b716ae4d9e938236771d49a880480eb66e.
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 617e913..b0da06a 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -787,11 +787,11 @@
  * Enable "non-blocking" ECC operations that can return early and be resumed.
  *
  * This allows various functions to pause by returning
- * #MBEDTLS_ERR_ECP_IN_PROGRESS (or, for functions in Mbed TLS's SSL module,
- * MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS) and then be called later again in order
- * to further progress and eventually complete their operation. This is
- * controlled through mbedtls_ecp_set_max_ops() which limits the maximum number
- * of ECC operations a function may perform before pausing; see
+ * #MBEDTLS_ERR_ECP_IN_PROGRESS (or, for functions in the SSL module,
+ * #MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS) and then be called later again in
+ * order to further progress and eventually complete their operation. This is
+ * controlled through mbedtls_ecp_set_max_ops() which limits the maximum
+ * number of ECC operations a function may perform before pausing; see
  * mbedtls_ecp_set_max_ops() for more information.
  *
  * This is useful in non-threaded environments if you want to avoid blocking