Merge "trusty/storage: Add property indicating when fs is ready" am: a3e605486d am: c8d405ebd8

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

Change-Id: I2ea7a38c5388278497d37d4cd94bf5945703a8d8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>