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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I274f4f6fd7f0898f6fee99a2cf463ce927c08653