Merge "trusty/storage: Add property indicating when fs is ready" am: a3e60548

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2310114



Change-Id: I096c47014cc8911c26cc06a7a02627ccb7c99966
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>