jtag/adapter: move 'usb location' code in adapter.c

The configuration code for adapter parameters is spread around.

Add a struct in adapter.c aimed at containing all the adapter's
configuration data.
Move in adapter.c the code related to configuring 'usb location'
and the copyright tag.
Add adapter.h to export the functions.
While there:
- rework the copyright and the SPDX tag;
- rename the 'usb location' functions;
- remove the JTAG_SRC variable in Makefile.am.

Change-Id: I4fe0d32991a8a30e315807180688035ae9ee01ce
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6640
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>

src/jtag/adapter.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2018 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
+ */
+
+#ifndef OPENOCD_JTAG_ADAPTER_H
+#define OPENOCD_JTAG_ADAPTER_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/** @returns USB location string set with command 'adapter usb location' */
+const char *adapter_usb_get_location(void);
+
+/** @returns true if USB location string is "<dev_bus>-<port_path[0]>[.<port_path[1]>[...]]" */
+bool adapter_usb_location_equal(uint8_t dev_bus, uint8_t *port_path, size_t path_len);
+
+#endif /* OPENOCD_JTAG_ADAPTER_H */