Add local impl of mapper for libhidlmemory am: 74646ab019

Original change: https://android-review.googlesource.com/c/platform/system/libhidl/+/2819045

Change-Id: I02c0fd9a1005f2fb7e4556631085f45f5f7700c3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>