storaged: protect global proto_loaded am: 4913d3d7 am: ab1359a7 am: f03fdfcb am: b01c1fea

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/13112708



Change-Id: Ie6d23b940aeca11e5980001be4d44a5bba582b14
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>