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

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

Change-Id: I2411223a131211cf2eb955a2e126627a9189e1d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>