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

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

Change-Id: I1111761b30dfb877352a570b7070df6c849e64df
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>