Match cache size between puffdiff and lz4diff am: ea4ca42744 am: 80c79779cc am: 80b223a90f

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2850109

Change-Id: I5f96b42739258417223f1b7735df9ef77423fa68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>