Merge "Customize StubVolume implementation for ARC" am: 253dd94521 am: 802d1d256a

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/1532070

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I58e6378fbe15bc038d34f9a2699bce7b50625df9