pkt_sched: Rename PSCHED_US2NS and PSCHED_NS2US

Let's use TICKS instead of US, so PSCHED_TICKS2NS and PSCHED_NS2TICKS
(like in PSCHED_TICKS_PER_SEC already) to avoid misleading.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 120935b..82a3191 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -43,15 +43,15 @@
 
 /* Avoid doing 64 bit divide */
 #define PSCHED_SHIFT			6
-#define PSCHED_US2NS(x)			((s64)(x) << PSCHED_SHIFT)
-#define PSCHED_NS2US(x)			((x) >> PSCHED_SHIFT)
+#define PSCHED_TICKS2NS(x)		((s64)(x) << PSCHED_SHIFT)
+#define PSCHED_NS2TICKS(x)		((x) >> PSCHED_SHIFT)
 
-#define PSCHED_TICKS_PER_SEC		PSCHED_NS2US(NSEC_PER_SEC)
+#define PSCHED_TICKS_PER_SEC		PSCHED_NS2TICKS(NSEC_PER_SEC)
 #define PSCHED_PASTPERFECT		0
 
 static inline psched_time_t psched_get_time(void)
 {
-	return PSCHED_NS2US(ktime_to_ns(ktime_get()));
+	return PSCHED_NS2TICKS(ktime_to_ns(ktime_get()));
 }
 
 static inline psched_tdiff_t