Re-map source partitions with RW permission during OTA am: 08bbbd4964

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3243626

Change-Id: I9a94a1fb78918d9e1258b1d3b18a98661cf61585
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>