arm_tpiu_swo: add support for independent TPIU and SWO

This is supposed to replace big part of armv7m_trace.[ch], since
TPIU is not only the one implemented in Cortex-M3 and M4.

Change-Id: I7588d16cbefe9cdb371c52fb0aa5cdfb48518804
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5858
Tested-by: jenkins

src/target/arm_tpiu_swo.h

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef OPENOCD_TARGET_ARM_TPIU_SWO_H
+#define OPENOCD_TARGET_ARM_TPIU_SWO_H
+
+int arm_tpiu_swo_register_commands(struct command_context *cmd_ctx);
+int arm_tpiu_swo_cleanup_all(void);
+
+#endif /* OPENOCD_TARGET_ARM_TPIU_SWO_H */