Introduce and use MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED

Introduce and use
MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED to
guard TLS code (both TLS 1.2 and 1.3) specific
to handshakes involving certificates.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 6ae85d9..8b2a8b6 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1444,13 +1444,13 @@
     void *MBEDTLS_PRIVATE(p_async_config_data); /*!< Configuration data set by mbedtls_ssl_conf_async_private_cb(). */
 #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
 
-#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED)
 
 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
     const int *MBEDTLS_PRIVATE(sig_hashes);         /*!< allowed signature hashes           */
 #endif
     const uint16_t *MBEDTLS_PRIVATE(sig_algs);      /*!< allowed signature algorithms       */
-#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
+#endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */
 
 #if defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_DEPRECATED_REMOVED)
     const mbedtls_ecp_group_id *MBEDTLS_PRIVATE(curve_list); /*!< allowed curves             */
@@ -3598,7 +3598,7 @@
 void mbedtls_ssl_conf_groups( mbedtls_ssl_config *conf,
                               const uint16_t *groups );
 
-#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED)
 #if !defined(MBEDTLS_DEPRECATED_REMOVED) && defined(MBEDTLS_SSL_PROTO_TLS1_2)
 /**
  * \brief          Set the allowed hashes for signatures during the handshake.
@@ -3644,7 +3644,7 @@
  */
 void mbedtls_ssl_conf_sig_algs( mbedtls_ssl_config *conf,
                                 const uint16_t* sig_algs );
-#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
+#endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */
 
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 /**