Verify the extents for untouched dynamic partitions during partial update am: 24f960986b am: c8fb8e1c60 am: b1f2b8932d am: e56c12a6c2

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1354125

Change-Id: I74e2fd46f1dd30097d3fd1170d8775aacabd3263