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

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



Change-Id: I2f56f936b21bc3d74e965d3eef7130b226f4b39f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>