Match cache size between puffdiff and lz4diff am: ea4ca42744

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

Change-Id: I888d45e6876a0301fc39242de622361f51782e48
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>