update_engine: uint64_t of partition size am: f1a360beb5

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3280978

Change-Id: Ifd3c24c7f6f5978ae8f7f863d169c7c74769eb91
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>