configure.ac: Replace --enable-verbose-usb-comms with a new runtime log level.

--enable-verbose actually did the same as --enable-verbose-usb-comms,
so the new code replaces it too.

Change-Id: I1d1ddd5d681009663e0c52a75ad76fe71dbc172a
Signed-off-by: R. Diez <rdiez-2006@rd10.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/9281
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins
Reviewed-by: Marc Schink <dev@zapb.de>

src/helper/log.h

@@ -37,6 +37,9 @@
  * LOG_LVL_INFO - state information, etc.
  * LOG_LVL_DEBUG - debug statements, execution trace
  * LOG_LVL_DEBUG_IO - verbose debug, low-level I/O trace
+ * LOG_LVL_DEBUG_USB - verbose USB trace
+ *                     In the past this corresponded to build configuration options
+					   --enable-verbose and --enable-verbose-usb-comms.
  */
 enum log_levels {
 	LOG_LVL_SILENT = -3,
@@ -47,6 +50,7 @@ enum log_levels {
 	LOG_LVL_INFO = 2,
 	LOG_LVL_DEBUG = 3,
 	LOG_LVL_DEBUG_IO = 4,
+	LOG_LVL_DEBUG_USB = 5,
 };
 
 void log_printf(enum log_levels level, const char *file, unsigned int line,
@@ -100,6 +104,8 @@ extern int debug_level;
 
 #define LOG_LEVEL_IS(FOO)  ((debug_level) >= (FOO))
 
+#define LOG_DEBUG_USB(expr, ...) LOG_CUSTOM_LEVEL(LOG_LVL_DEBUG_USB, expr, ##__VA_ARGS__)
+
 #define LOG_DEBUG_IO(expr ...) \
 	do { \
 		if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO)) \