Merge "mmap-perf: Remove use of hardcoded PAGE_SIZE 4096" into main am: b8af8d3a18 am: 89ecaee62c am: 9fc9108072

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2700536

Change-Id: I69254a6c593302f96495659d8fd811e59e6c97b0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>