Added a field to set enable_vabc am: 9fc62b8132

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2508075

Change-Id: I75f4c67ffe3364a61a693e846ffad2ef2e83a7c9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>