Merge "Add 'aosp.createMmapBuffer' definition" into main am: 375121a4b1

Original change: https://android-review.googlesource.com/c/platform/system/media/+/3549901

Change-Id: I976af538ae292867354cb721d2fa327ed4a311d8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>