Move enabling sdcardfs behind a property am: f36bdddc7e am: 09daf93c62 am: 82b2e7f6a0

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/vold/+/11444750

Change-Id: I80b50c1ef75f80e9595e7bd864897b692304dac6