Support ZERO op in ota extractor am: cf323870b4

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2045685

Change-Id: Ib98cb104b7167300c6001fd8a5d30a81358917f5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>