storaged: protect global proto_loaded am: 32b5003cf6 am: 4d4322a32e am: c3f62e1b73

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/13113781

Change-Id: I69f521b77255768fce1dd8aeb87847a5add71b9b