[automerger skipped] Merge "Enable improved user separation by default." am: 9ad4f042ff am: 66aedd52a2 am: 41fa197c9a -s ours

am skip reason: Change-Id Ic9da534f1a5f4c9e3bd62ea5c09a3b11ebcb33e7 with SHA-1 763393644a is in history

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/1522938

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I293329fa6879a0878c541d0d7fc28254efec17dd