API review: TrafficStats: rename Pkts to Packets

Rename getMobileTxPackets(), getMobileRxPackets(), getTotalTxPackets(),
getMobileRxPackets()

bug 2420318
diff --git a/services/java/com/android/server/NetStatService.java b/services/java/com/android/server/NetStatService.java
index 0834405..ac3445e 100644
--- a/services/java/com/android/server/NetStatService.java
+++ b/services/java/com/android/server/NetStatService.java
@@ -27,11 +27,11 @@
     }
 
     public long getMobileTxPackets() {
-        return TrafficStats.getMobileTxPkts();
+        return TrafficStats.getMobileTxPackets();
     }
 
     public long getMobileRxPackets() {
-        return TrafficStats.getMobileRxPkts();
+        return TrafficStats.getMobileRxPackets();
     }
 
     public long getMobileTxBytes() {
@@ -43,11 +43,11 @@
     }
 
     public long getTotalTxPackets() {
-        return TrafficStats.getTotalTxPkts();
+        return TrafficStats.getTotalTxPackets();
     }
 
     public long getTotalRxPackets() {
-        return TrafficStats.getTotalRxPkts();
+        return TrafficStats.getTotalRxPackets();
     }
 
     public long getTotalTxBytes() {