lwip: Rename esp32 port layer to esp32xx

As it reflects all chips from esp32-xx family, not only esp32

components/lwip/port/esp32xx/include/arch/vfs_lwip.h

@@ -0,0 +1,15 @@
+/*
+ * SPDX-FileCopyrightText: 2017-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void esp_vfs_lwip_sockets_register(void);
+
+#ifdef __cplusplus
+}
+#endif