Remove METADATA file am: e6d0d93f27 am: 9368916a2b

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3398739

Change-Id: I0a71e70e03e305ed353f312ccd3c0ed27dac7237
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>