Match cache size between puffdiff and lz4diff am: ea4ca42744 am: f8a3f4ea3c

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

Change-Id: I8b17441c30c9a579ff635c2c3bc1597faa5bc350
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>