Halve test erofs image size am: 6fb5303589 am: 1a9bea81ff am: 0180efb3f5 am: 8cd7b84b85

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2234809

Change-Id: Iaff562d6be39f9704f608031fbfe513468d622b2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>