Add IPDBG JtagHost functionality to OpenOCD

IPDBG are utilities to debug IP-cores. It uses JTAG for
transport to/from the FPGA. The different UIs use TCP/IP
as transport. The JtagHost makes the bridge between these
two.

Comparable to the bridge between GDB and the in-circuit-
debugging-unit of a micro controller.

Change-Id: Ib1bc10dcbd4ea426e492bb7b2d85c1ed1b7a8d5a
Signed-off-by: Daniel Anselmi <danselmi@gmx.ch>
Reviewed-on: http://openocd.zylin.com/5938
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/server/ipdbg.h

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2020 by Daniel Anselmi <danselmi@gmx.ch> */
+
+#ifndef OPENOCD_IPDBG_IPDBG_H
+#define OPENOCD_IPDBG_IPDBG_H
+
+#include <helper/command.h>
+
+int ipdbg_register_commands(struct command_context *cmd_ctx);
+
+#endif /* OPENOCD_IPDBG_IPDBG_H */