hv: PTM: Add virtual root port

Add virtual root port that supports the most basic pci-e bridge and root port operations.

	- init_vroot_port(): init vroot_port's basic registers.

	- deinit_vroot_port(): reset vroot_port

	- read_vroot_port_cfg(): read from vroot_port's virtual config space.

	- write_vroot_port_cfg(): write to vroot_port's virtual config space.

Tracked-On: #5915
Signed-off-by: Rong Liu <rong.l.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
Acked-by: Jason Chen <jason.cj.chen@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>

hypervisor/include/dm/vroot_port.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021 Intel Corporation.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#ifndef __VROOT_PORT_H
+#define __VROOT_PORT_H
+
+#include "vpci.h"
+
+#define VROOT_PORT_VENDOR			0x8086U
+#define VROOT_PORT_DEVICE			0x9d14U
+
+extern const struct pci_vdev_ops vroot_port_ops;
+
+#endif