storaged: protect global proto_loaded am: 33206d393c am: 0ed516e795 am: 36d6092946

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/13113445

Change-Id: I836975bbaa353d8ed225ff937b4ffeff9ab47133
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>