Add sprint_ticks() function and use in CBQ

[IPROUTE]: Add sprint_ticks() function and use in CBQ

Add helper function to print ticks to avoid assumptions about clock
resolution in CBQ.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
diff --git a/tc/tc_util.c b/tc/tc_util.c
index b73fae9..a7e4257 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -255,6 +255,11 @@
 	return buf;
 }
 
+char * sprint_ticks(__u32 ticks, char *buf)
+{
+	return sprint_time(tc_core_tick2time(ticks), buf);
+}
+
 int get_size(unsigned *size, const char *str)
 {
 	double sz;