Fix gyro reading code when it misses cycles

Change-Id: Ife59545495709eda7a9e4c9961a1b78125cd975b
diff --git a/aos/common/time.cc b/aos/common/time.cc
index d1985b5..019cb52 100644
--- a/aos/common/time.cc
+++ b/aos/common/time.cc
@@ -47,6 +47,14 @@
 
 }  // namespace
 
+const int32_t Time::kNSecInSec;
+const int32_t Time::kNSecInMSec;
+const int32_t Time::kNSecInUSec;
+const int32_t Time::kMSecInSec;
+const int32_t Time::kUSecInSec;
+
+const Time Time::kZero{0, 0};
+
 void Time::EnableMockTime(const Time &now) {
   MutexLocker time_mutex_locker(&time_mutex);
   mock_time_enabled = true;