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

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



Change-Id: I2d8d52b6372d2025cdfb9b7b353908733c14a66d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>