storaged: protect global proto_loaded am: 33206d39 am: 0ed516e7

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



Change-Id: I97509e530b565633490cc63d41a93ff251a08b68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>