Merge "Prevent writing to FRP partition during factory reset." into lmp-mr1-dev am: 4bd97eb888 am: a8484b4f92 am: d7f2a4b0c7 am: b64af9bacd am: e15e0de7e5
am: 6bb6f02a15

Change-Id: I849811a3be2c6989edea3ed6f938b4b36a4fabe7