Configure backing device max_ratio for FUSE filesystems. am: a485006ab1 am: bb8a543e43 am: cf0499038f

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

Change-Id: I136973c26c66eae2f582885e19749753cdbff7e5