Merge "Revert "Revert "Customize StubVolume implementation for ARC""" am: a8ebbe77a0

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/1553860

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ifed0e9026edb4ef80354e245336c11d4748dc491