Configure backing device max_ratio for FUSE filesystems. am: a485006ab1 am: 5ed648d098 am: c980b5387a

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/vold/+/12024019

Change-Id: I49bec11d9aa1328d5cd7b45da098d4421af6f961