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>

clock.c

diff --git a/clock.c b/clock.c
index af82f21..348ff94 100644
--- a/clock.c
+++ b/clock.c
@@ -2091,6 +2091,22 @@
 	return 0;
 }
 
+static char *get_port_states(struct clock *c)
+{
+	static char buffer[128];
+	struct port *piter;
+	int len = 0;
+
+	LIST_FOREACH(piter, &c->ports, list) {
+		enum port_state ps = port_state(piter);
+
+		len += snprintf(buffer + len, sizeof(buffer) - len,
+		    " %d-%s",
+		    port_number(piter), ps_str[ps]);
+	}
+	return buffer;
+}
+
 enum servo_state clock_synchronize(struct clock *c, tmv_t ingress, tmv_t origin)
 {
 	enum servo_state state = SERVO_UNLOCKED;
@@ -2178,9 +2194,10 @@
 		clock_stats_update(&c->stats, tmv_dbl(c->master_offset), adj);
 	} else {
 		pr_info("master offset %10" PRId64 " s%d freq %+7.0f "
-			"path delay %9" PRId64,
+			"path delay %9" PRId64 " %s",
 			tmv_to_nanoseconds(c->master_offset), state, adj,
-			tmv_to_nanoseconds(c->path_delay));
+			tmv_to_nanoseconds(c->path_delay),
+			get_port_states(c));
 	}
 
 	clock_notify_event(c, NOTIFY_TIME_SYNC);