storaged: protect global proto_loaded am: 4d3fe5ab72 am: 96c38ce6a2 am: 7fa827fdd5 am: df566bb9b1

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/13112711

Change-Id: I7d671ec4a901533d9e4599df0596e34375efc6d7