Merge "fs_mgr_overlayfs: Try "/system" and "/" when setting "/system" shared...

Merge "fs_mgr_overlayfs: Try "/system" and "/" when setting "/system" shared type" am: 44f1f094 am: c57557ba am: b31d1e05

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2159442



Change-Id: I0da9d581af8e9372f9a4bd9f56b96a9e84ae9991
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>