Skip filesystem verification if it's already done am: f844198240 am: d576ccce41

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2334902

Change-Id: I5027231759213630a173b7a2061a934c84cde782
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>