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

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

Change-Id: Ib2c95136405e73353826e0ad1ec8617285fadd7a