update_engine: use ; delimiter am: 0215aa7b06

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3219875

Change-Id: Ia453be6fb110f32b81b13b1c247b650c3a32b498
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>