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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I428a4b0bc668e1895a8e3e36c0f7cc5801ccf92b