init: do not create dev.mnt. properties for emulated mounts am: 7e4ce2b578 am: f139523a97

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/13612491

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1b2a83e6fb0e17d5bf197d20660298f0f1594011