Remove log spams from update_engine am: 9dbdcfb78c

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2391314

Change-Id: I5893b186c6327c172da39a45e10a0ca39554fc3f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>