Configure backing device max_ratio for FUSE filesystems. am: a485006ab1 am: 5ed648d098 am: 6589ae36c3

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

Change-Id: I20555c69735747460b0ffe137a116b566ef5b158