Fix serialization bug in GpsNavigationMessage am: 8bcd86e662 am: 0fa0b6b222 am: 8ff472434b am: 5d7d2aa056

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15878936

Change-Id: Iacb607e1fdae66228b8237a2385c897c1942f43f