Set default timestamp to elapsedRealtimeNanos

Test: m -j libstatssocket compiles

Change-Id: I62f4c6bb14c3914124a6af25ff46fb0a980204e7
diff --git a/libstats/Android.bp b/libstats/Android.bp
index c5d05ec..0440087 100644
--- a/libstats/Android.bp
+++ b/libstats/Android.bp
@@ -22,7 +22,7 @@
     srcs: [
         "stats_event_list.c",
         "statsd_writer.c",
-	"stats_event.c",
+        "stats_event.c",
     ],
     host_supported: true,
     cflags: [