ssl: Added session getter for ciphersuite_id.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 4c085b0..cdc0996 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -2743,6 +2743,18 @@
 }
 
 /**
+ * \brief          Get the ciphersuite-id.
+ *
+ * \param session  SSL session.
+ *
+ * \return         int represetation for ciphersuite.
+ */
+static inline int mbedtls_ssl_session_get_ciphersuite_id(const mbedtls_ssl_session *session)
+{
+    return session->MBEDTLS_PRIVATE(ciphersuite);
+}
+
+/**
  * \brief   Configure a key export callback.
  *          (Default: none.)
  *