Allow on device spl downgrade check to be bypassed am: 85a6d997f5

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2800054

Change-Id: I4b2061d413669229788d1cb55183225d577262ed
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>