Merge "partition_tools: extend lpunpack for split partitions" am: d9481184ff

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2505925

Change-Id: I561c8a7f9783212359da9eaa528461d147bc36bf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>