Merge "DynamicSystemInstallationService: Support remount for DSU guest system" am: 4896c7f2ac am: b64a3f5871

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1537222

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic2468f5f90cc7ae789ab0a1b5eaa4262e279c429