DM: separate pty vuart operation from IOC

for pty vuart operation will be commonly used by other module,
like pm-vuart: control UOS power off through vuart.

Tracked-On: #3564
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>

devicemodel/include/pty_vuart.h

@@ -0,0 +1,16 @@
+/*
+ * Project Acrn
+ * Acrn-dm-pty
+ *
+ * Copyright (C) 2019 Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#ifndef __PTY_H__
+#define __PTY_H__
+
+int pty_open_virtual_uart(const char *dev_name);
+
+#endif