clock: Add port details. Add state of the port to the output. It helps to identify the port state if the transition message is no longer available. In HSR/PRP mode there is more than one port involved. The output may look like | ptp4l[265.598]: master offset -1366 s2 freq +7242 path delay 413 1-SLAVE 2-PASSIVE_SLAVE Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>